T1 + T4 + AS at Buttonwillow Raceway Park

2024-03-01 AS Request to Classify 1970-1981 Camaro and Firebird in AS

#33659 from Brandon Vivian · Rule change · TB 24-03 (2024-03 Fastrack)

In AS Spec Lines, classify Chevrolet Camaro, Pontiac Firebird (70-81) Full Prep as follows:
AS Wheelbase Gear Ratios
Std. (or Alt.)
Brakes
(Max)
(in/mm)
Weight (lbs) Notes:

A specification table follows in the original; it is not shown here.

2024-03-01 AS Fuel Cell 12

#34194 from Clark Cambern · Rule change · TB 24-03 (2024-03 Fastrack)

In AS Spec Lines, add to Notes as follows:
Cadillac CTS-V (04-07): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken
from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell.”
Chevrolet/Pontiac Camaro & Firebird (93-02): “Fuel cells must be located within 24 inches of the standard tank. The 24 inch
measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with
installation of a safety fuel cell.”
Chevrolet/Pontiac Camaro & Firebird (93-02): “Fuel cells must be located within 24 inches of the standard tank. The 24
inch measurement is taken from the perimeter of the stock and alternative fuel cell. Fuel filler location is unrestricted with

2024-03-01 T4 Reorganize Spec Lines

#35375 from Touring Committee · Rule change · TB 24-03 (2024-03 Fastrack)

In T2-T4 Spec Lines, change Spec Line as follows:
"Wheel- base (mm) Required Restrictor"

2024-03-01 T1 9.1.9.1 T1 new category item/ line 26 rule to expire Jan 1 2023

#35411 from Geoffrey Hegel · Rule change · TB 24-03 (2024-03 Fastrack)

In T1 Spec Lines, classify Pontiac GTO 2006-2009 as Spec Line Number 1590 as follows:

A specification table follows in the original; it is not shown here.

2024-03-01 T4 Allow any 400lb rear spring in the RX8

#35433 from Raymond Blethen · Rule change · TB 24-03 (2024-03 Fastrack)

In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change Notes as follows:
"Mazda Motorsports- 0000- 04-9700-08 or Eibach- 0800.250.0700 (R) Mazda Motorsports- 0000-04-9400-07 or Eibach
0700.250.0400, and helper 0000-04-9926 allowed. Springs allowed 700lb (f), 400(r)."

2024-03-01 AS Please Classify the 6th Gen Into AS.

#35448 from Daniel Richardson · Rule change · TB 24-03 (2024-03 Fastrack)

In AS Spec Lines, classify Chevrolet Camaro (16-) Full Prep as follows:
AS
Wheelbase Gear Ratios
Std. (or Alt.)
Brakes
(Max)
(in/mm)
Weight (lbs) Notes:

A specification table follows in the original; it is not shown here.

2024-03-01 T4 370Z Brake Rotor Size Correction

#35487 from Derek Chan · Rule change · TB 24-03 (2024-03 Fastrack)

In T2 Spec Lines, Nissan 370Z (09-17) / 370Z NISMO Edition (09-17), change Brakes (mm) as follows:
"(F)320 x 28 Vented R)320 x 16 Vented : (F) 355x32mm Vented(R) 350x20mm Vented”
In T3 Spec Lines, Nissan 370Z, incl. Nismo (2009-2022), change Brakes (mm) as follows:
"(F)320 x 28 Vented (R)320 x 16 Vented : (F) 355x32mm Vented(R) 350x20mm Vented”

2024-03-01 AS spec lines

#35713 from American Sedan Committee · Rule change · TB 24-03 (2024-03 Fastrack)

In AS Spec Lines, classify Ford Mustang GT (05-14) with Restricted prep Engine as follows:
AS
Wheelbase Gear Ratios Std.

A specification table follows in the original; it is not shown here.

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe, Pratt Cole

2024-04-01 T1 Honda S2000

#35582 from Touring Committee · Rule change · TB 24-04 (2024-04 Fastrack)

In T1 Spec Lines, classify Honda S2000 as follows:

A specification table follows in the original; it is not shown here.

2024-04-01 AS Restricted Prep Aftermarket Parts Request

#35682 from Tom Aquilante · Rule change · TB 24-04 (2024-04 Fastrack)

In AS Spec Lines, Chevrolet/Pontiac Camaro & Firebird (93-02), add to Notes the following:
"For the LS1connecting rods Callies p/n CSC6100DS6A2AH, Scat rods p/n 2-1CR6100-944, GM performance rods p/n 12649190."
In AS Spec Lines, Pontiac GTO (04-06), add to Notes the following:
"For the LS1connecting rods Callies p/n CSC6100DS6A2AH, Scat rods p/n 2-1CR6100-944, GM performance rods p/n 12649190."

2024-04-01 T4 Corrections to T4 RX8 Spec line

#35767 from Touring Committee · Rule change · TB 24-04 (2024-04 Fastrack)

In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change Notes as follows:
"Mazdaspeed radiator #0000-01-8501 allowed. Mazdaspeed coil spring kit #QSEA-34-01Z allowed. OE Rear spoiler allowed
#F151-V4-920F. OE front air dam allowed #F151-V4-900f-BB. Springs allowed 700lb (f) max, 400(r) max. Oil metering pump may
be bypassed. Alternate sway bars allowed max 32mm (f) 19mm (r)."

2024-04-01 AS Allowance of 11

#35824 from American Sedan Committee · Rule change · TB 24-04 (2024-04 Fastrack)

In AS Spec Lines, Cadillac CTS-V (04-07), add to Notes the following:
"11" wide wheels can be used until 3/1/25."
In AS Spec Lines, Chevrolet Camaro SS (V8) (10-15), add to Notes the following:
"11" wide wheels can be used until 3/1/25."
In AS Spec Lines, Dodge Challenger (08-20), add to Notes the following:
"11" wide wheels can be used until 3/1/25."
In AS Spec Lines, Ford Mustang GT 5.0l (15-17), add to Notes the following:
"11" wide wheels can be used until 3/1/25."

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe, Pratt Cole

2024-05-01 AS 6th gen Camaro limited prep

#35733 from American Sedan Committee · Rule change · TB 24-05 (2024-05 Fastrack)

In AS Spec Lines, classify Chevrolet Camaro 1LE (2016-) as follows:
AS Wheelbase Gear Ratios Std. (or Alt.)
Brakes
(Max)
(in/mm)
Weight (lbs.) Notes:
Chevrolet
Camaro, 1LE

A specification table follows in the original; it is not shown here.

2024-05-01 T4 Allow T4 and T3 RX8 to Disable/Remove Factory Oil Inj.

#35761 from David Mead · Rule change · TB 24-05 (2024-05 Fastrack)

In T3 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), add to Notes as follows:
"OEM oil injection system may be removed or disabled."
In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), add to Notes as follows:
"OEM oil injection system may be removed or disabled."

2024-05-01 AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK

#35825 from Desi Colon · Rule change · TB 24-05 (2024-05 Fastrack)

In AS Spec Lines, classify Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V-8 LS1 (Aluminum Block, Aluminum Heads) 2 valves
per cylinder, as follows:
AS Wheelbase Gear Ratios Std.

A specification table follows in the original; it is not shown here.

2024-05-01 T4 2023 ND2 Miata Classification and Allowances

#35837 from Coyote Black · Rule change · TB 24-05 (2024-05 Fastrack)

In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-21), change Year as follows:
"(19-21 24)"
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-21), add to Notes as follows:
"Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs #0000-04-9700-
08, springs up to 500lb front and 300lb rear allowed. Mazda tower brace 0000-04-5626 allowed."

2024-05-01 T4 Errors and Omissions for 06-09 VW Rabbit Rotor

#35851 from Andrew Burke · Rule change · TB 24-05 (2024-05 Fastrack)

In T4 Spec Lines, Volkswagen Rabbit 2.5 (06-09), change Brakes as follows:
"(F) 228 288 Vented Disc (R) 260 Solid Disc"

2024-05-01 AS Full Prep Head

#35891 from American Sedan Committee · Rule change · TB 24-05 (2024-05 Fastrack)

In AS Spec Lines, Chevrolet/Pontiac Camaro & Firebird (82-92), add to Notes the following:
"Flo Tek Head part #102-500 are permitted."
In AS Spec Lines, Chevrolet/Pontiac Camaro & Firebird (93-02), add to Notes the following:
"Flo Tek Head part #102-500 are permitted."
In AS Spec Lines, Chevrolet Camaro (10-15), add to Notes the following:
"Flo Tek Head part #102-500 are permitted."
In AS Spec Lines, Ford Mustang Incl. Cobra & Cobra R (79-93) and Mercury Capri (79-86), add to Notes the following:
"Flo Tek Part # 203-500 are permitted."

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe, Pratt Cole

2024-05-01 T4 Driveshafts

#35916 from Scotty B White · Rule change · TB 24-05 (2024-05 Fastrack)

In GCR Section 9.1.9.2.D.4.b., add the following:
"6. T2-T3- Driveshafts may be replaced with alternative materials ie. carbon fiber, aluminum, steel. Two-piece driveshafts may
be replaced with one-piece units. If non-OEM driveshaft is used, add 25 lbs."

2024-05-01 T1 Please Expedite classing the C63 Mercedes

#35987 from Touring Committee · Rule change · TB 24-05 (2024-05 Fastrack)

In T1 Spec Lines, classify Mercedes AMG-C63 S (2023) as follows:

A specification table follows in the original; it is not shown here.

2024-05-01 T4 GCR ERROR - letter not properly applied to GCR

#35999 from Touring Committee · Rule change · TB 24-05 (2024-05 Fastrack)

In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Notes as follows:
"Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must remain
stock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from moving
action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including
Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r) sway bars
allowed. Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs #0000-
04-9700-08, rear springs #0000-04-9400-07, helper springs #0000-04-HLPR-EB (optional). Up to 500lb front and 300lb rear
springs allowed. Mazda Motorsports Header part #0000-06-5410 allowed. Mazda tower brace 0000-04-5626 allowed."

Applies to Mazda MX-5 on this page: Oscar Jackson

Applies to Mazda Miata on this page: Kristina Etherington, Kayla Etherington

2024-06-01 AS Request for Classification of 2018-2023 mustang In

#35764 from Michael Kamalian · Rule change · TB 24-06 (2024-06 Fastrack)

AS Spec Lines, classify Ford Mustang GT 5.0L (2018-) as follows:
AS Wheelbase Gear Ratios

A specification table follows in the original; it is not shown here.

2024-06-01 T4 Allow OEM Front Spoiler 06-08 Miata in T4

#35941 from David Mead · Rule change · TB 24-06 (2024-06 Fastrack)

In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), add to Notes the following: "Front
spoiler permitted (NF51-V4-900F)."

Applies to Mazda MX-5 on this page: Oscar Jackson

2024-06-01 T4 T4 Mustang Weight Reduction In T4 Spec

#36051 from Scotty B White · Rule change · TB 24-06 (2024-06 Fastrack)

Lines, Ford Mustang V6 (05-10), change as follows:
Weight: "3275 3225"
Notes: "14” Brembo Brake Kit#M-2300-S permitted."

2024-06-01 T4 R53 Mini Cooper S spec line request In

#36056 from Manvinder Singh · Rule change · TB 24-06 (2024-06 Fastrack)

T4 Spec Lines, Mini Cooper S (02-04), add to Notes the following:
"Milltek exhaust manifold #SSXM459 allowed. 25mm rear sway bar allowed."
T4 Spec Lines, Mini Cooper S (05-06), add to Notes the following:
"Milltek exhaust manifold #SSXM459 allowed. 25mm rear sway bar allowed."

2024-07-01 T4 Mustang T2/T3

#35877 from Scotty B White · Rule change · TB 24-07 (2024-07 Fastrack)

In T2 Spec Lines, Ford Mustang GT 5.0L (15-17), add to Notes as follows:
"Track/Performance Package parts permitted."
In T2 Spec Lines, Ford Mustang GT 5.0L (2018-), add to Notes as follows:
"Track/Performance Package parts permitted."
In T3 Spec Lines, Ford Mustang V6 (15-17), change Notes as follows:
"Track/Performance package allowed."

2024-07-01 T4 Homologation of car to T4

#36030 from Patrick E Morgan · Rule change · TB 24-07 (2024-07 Fastrack)

In T4 Spec Lines, Mercedes C300 4Matic (2008-2011), classify as follows:

A specification table follows in the original; it is not shown here.

2024-07-01 T4 T2-T4 Driveshaft Mistake...?

#36050 from Scotty B White · Rule change · TB 24-07 (2024-07 Fastrack)

In GCR Section 9.1.9.2.D.4.b.6., remove as follows:
"If non-OEM driveshaft is used, add 25 lbs."
In T2 Spec Lines, Ford Mustang V6 (11-14), change Notes as follows:
"Driveshaft from Alternate metallic driveshaft is allowed."
In T2 Spec Lines, Ford Mustang Boss 302 (12-13), change Notes as follows:
"Alternate metallic driveshaft is allowed."
In T2 Spec Lines, Ford Mustang GT 5.0L (11-14)ki, change Notes as follows:
"Alternate metallic driveshaft is allowed."

2024-07-01 T4 MINI Cooper S Spec Lines Corrections.

#36086 from David Oliveira · Rule change · TB 24-07 (2024-07 Fastrack)

In T4 Spec Lines, Mini Cooper S (02-04), delete spec line in its entirety.
In T4 Spec Lines, Mini Cooper S (05-06), change Model as follows:
"Mini Cooper S R53 (0205-06)"
In T4 Spec Lines, Mini Cooper S (07-13), change Model and Notes as follows:
"Mini Cooper S R56 (07-13)"
Notes: "The following items must remain stock: shock/struts (including mounts), original wheels, and transmission
differential - unless specified below. Convertible model not allowed. Factory optional limited slip differential allowed.
JCW struts (F) 31 31 6 768 410 (R)33 52 6 768 412, springs (F)31 33 6 768 415 (R)33 53 6 768 418. May de-camber

2024-07-01 T4 Allow Removal of Sound Tubes

#36130 from Coyote Black · Rule change · TB 24-07 (2024-07 Fastrack)

In GCR Section 9.1.9.2.D.1.b., add the following:
"2. OEM intake- Chambers, resonators and acoustic devices may be removed, provided; that their ports are located
prior to any required restrictor, their ports are completely sealed, and that the part serves no other purpose."

2024-07-01 T4 B8/8.5 Audi S4 T3 and T2

#36195 from Brian Leib · Rule change · TB 24-07 (2024-07 Fastrack)

In T3 Spec Lines, Classify Audi S4 (2000-2002) as follows and allow the T2 spec line to expire.

A specification table follows in the original; it is not shown here.

2024-08-01 T4 T4 Camaro V6 weight reduction

#36232 from Ted Warning · Rule change · TB 24-08 (2024-08 Fastrack)

In T4 Spec Lines, Chevrolet Camaro V-6 (96-02), change weight as follows:
"3250 3150"

2024-08-01 T4 BOP adjustment for ND MX5s

#36345 from Touring Committee · Rule change · TB 24-08 (2024-08 Fastrack)

In T4 Spec Lines, change Weight (lbs) as follows:
Mazda MX-5 Miata/Club (16-18): "2700 2650"
Mazda MX5 Miata/Club/ RF (19-24): "2800 2750"

2024-09-01 AS Mustang transmission ratios

#36662 from American Sedan Committee · Rule change · TB 24-09 (2024-09 Fastrack)

In AS Spec Lines, Ford Mustang GT (05-14) with Restricted Prep Engine, add to Notes as follows:
"Alternate transmission Ratios 3.66, 2.43, 1.69, 1.32, 1.00, .68.”
In AS Spec Lines, Ford Mustang GT 5.0L (2018-), add to Notes as follows:
"Alternate transmission Ratios 3.24, 2.10, 1.42, 1.00, 0.81, .062."

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe, Pratt Cole

2024-11-01 T4 Bop Request 06-11 Honda Civic Si

#37013 from Mathew Milford · Rule change · TB 24-11 (2024-11 Fastrack)

In T4 Spec Lines, Honda Civic Si (06-11), add to Notes the following:
"LSD is permitted according to category rules."

2024-12-01 T1 Changes to T1 Tires for GT4 and Other Cars

#35383 from Andrew Aquilante · Rule change · TB 24-12 (2024-12 Fastrack)

In T1 GT4 Spec Lines, change Tire Size as follows:
Aston Martin Vantage AMR GT4 4010: "315 DOT, 305/660 Non-DOT"
Audi R8 GT4 - Spec Line #4020: "315 DOT, 305/645 Non-DOT"
BMW M4 GT4 - Spec Line #4030: "315 DOT, 305/660 Non-DOT"
Chevrolet Camaro GT4-R- Spec Line #4035: "315 DOT, 305/680 Non-DOT"
Ford Mustang GT4 - Spec Line #4040: "315 DOT, 315/680 Non-DOT"
Mclaren 570S GT4 - Spec Line #4050: "315 DOT, 305/645 Non-DOT"
Mercedes AMG GT4 - Spec Line #4060: "315 DOT, 305/660 Non-DOT"

2024-12-01 T1 G82 M4 GT4 inclusion in T1

#35864 from Denny Stripling · Rule change · TB 24-12 (2024-12 Fastrack)

In T1 GT4 Spec Lines, SL#4030, change as follows:
Model: "BMW M4 GT4 (F82)"
Performance Control: "Gold power stick Red power stick"
In T1 GT4 Spec Lines, classify BMW M4 GT4 (G82) as follows:

A specification table follows in the original; it is not shown here.

2024-12-01 T4 Redundant Verbiage Regarding Mustang Spec Lines for Driveshaft

#36484 from David Mead · Rule change · TB 24-12 (2024-12 Fastrack)

In T2 Spec Lines, change Notes as follows:
Ford Mustang V6 (11-14): "Alternate driveshaft is allowed."
Ford Mustang Boss 302 (12-13): "Alternate driveshaft is allowed."
Ford Mustang GT 5.0L (11-14): "Alternate driveshaft is allowed."
Ford Mustang GT 5.0L (15-17): "Alternate driveshaft is allowed."
Ford Mustang GT 5.0L (2018-): "Alternate driveshaft is allowed. Springs up to 800#/in front and rear permitted. Alternate
metallic driveshaft permitted."
Ford Mustang Coupe GT & Shelby GT 4.6L (05-10): "Alternate driveshaft is allowed."

2024-12-01 T1 Alt. Clutch Allowance

#36606 from Hugh Stewart · Rule change · TB 24-12 (2024-12 Fastrack)

In T1 Spec Lines, SL# 1050, change add to Engine Notes the following:
"5.5 inch clutch permitted."

2024-12-01 T4 R53 Mini Cooper S Weight Reduction Request

#36612 from Manvinder Singh · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, Mini Cooper S R53 (02-06), add to Notes as follows:
"Alta 15% Pulley #AMPENG20X allowed."

2024-12-01 T1 BOP Changes Need Updates

#36667 from Joe Rainey · Rule change · TB 24-12 (2024-12 Fastrack)

In T1 GT4 Spec Lines, Spec Line 4020, change as follows:
Performance Control: Power level 2020, 44mm 45mm SRO compliant restrictor"
Min. Weight with driver (LBS): "3550 3400"

2024-12-01 T4 Allowable Wheel Offset

#36855 from Robert Maples · Rule change · TB 24-12 (2024-12 Fastrack)

In GCR Section 9.1.9.2.D.7. Wheels and Tires, change as follows:
"a. Wheels
1. Any type wheel suitable for competition may be used, provided:
a. Any wheel not exceeding the specified diameter and rim width on the vehicle’s specification line may be used. Each wheel,
measured without weights, must weigh at least 15 lbs.
b. Wheels are permitted any offset provided the tire tread (that portion of the tire that contacts the ground) does not protrude
beyond the fender opening when viewed from 9.1.9.2.Touring (T2-T4) Category Specifications GCR - 660 the top perpendicular
to the ground, unless specified differently on the individual spec line for that car. To determine compliance the vehicle should be

2024-12-01 T4 Fuel Emissions Components

#37076 from Derrick Ambrose · Rule change · TB 24-12 (2024-12 Fastrack)

In GCR, Section 9.1.9.2.D.1.c. add the following:
"5. Removal of ancillary fuel tank equipment charcoal canisters, emissions valves, and sensors allowed for OEM or aftermarket
fuel cell installations."

2024-12-01 T4 2019-2024 Mazda 3 for T4

#37077 from Derrick Ambrose · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, classify Mazda 3 (19-24), as follows:

A specification table follows in the original; it is not shown here.

2024-12-01 T4 fix brake wording

#37129 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)

In GCR, Section, 9.1.9.2.D.6. Brakes, change as follows:
"a. Components
1. The make and material of brake pads and linings may be changed.
2. Brake fluid may be substituted with any brake fluid.
3. Brake rotor dust shields may be removed or replaced to accommodate brake ducts.
4. Flexible rubber brake lines may be replaced with Teflon lined, metal braided hoses.
5. Any brake ducts are permitted, but they must serve no other purpose. Fender liners may be modified solely for routing and
attachment of brake ducts. Duct intake openings may be created by the opening of 2 sections up to 14.5 square inches each in

2024-12-01 T4 Evaporative emissions systems

#37130 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)

In GCR, Section, 9.1.9.2.D.1.c., add the following:
"5. Removal of ancillary fuel tank equipment; charcoal canisters, emissions valves, and sensors allowed for OEM or aftermarket
fuel cell installations."

2024-12-01 T1 Request Ford Performance Darkhorse R in T1

#37136 from Christopher Childs · Rule change · TB 24-12 (2024-12 Fastrack)

In T1-Homologated Cars Spec Line, classify Mustang Darkhorse R (Mustang Challenge) as follows:
T1 – Homologated Cars

A specification table follows in the original; it is not shown here.

2024-12-01 T4 Allow Spec MX5 upgrade kit for 2009-11 RX8 S2 Transmision

#37140 from Chris Braunlich · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, add the following to Notes:
Mazda RX-8 Base/R3/Sport/ GT (04-12): "Transmission kit # 0000-02-5700 permitted.
Mazda MX-5 / Club Model (06-15): "Transmission kit # 0000-02-5700 permitted."
In T3 Spec Lines, add the following to Notes:
Mazda MX-5 / Club Model (06-15): "Transmission kit # 0000-02-5700 permitted."
Mazda RX-8 Base/R3/Sport/ GT (04-12): "Transmission kit # 0000-02-5700 permitted."

2024-12-01 T4 Move Spec Boxster to T4

#37158 from Rob Piekarczyk · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, classify Porsche Spec Boxster, as follows:

A specification table follows in the original; it is not shown here.

Applies to Porsche Boxster on this page: Lynne Griffiths

2024-12-01 T1 Car Mods for T1 Corvette under line item 1150

#37173 from Thomas Napolitano · Rule change · TB 24-12 (2024-12 Fastrack)

In GCR, Section 9.1.9.1.A.2,, add the following:
"It is permitted to roll under or flatten any interior lip on the wheel opening for tire clearance. Cars with plastic/composite
fenders may remove any interior wheel opening lip, but the resulting material edge shall be no thinner than the basic fender
material thickness. Non-metallic inner fender liners may be removed. Vents may be added to fenders."

2024-12-01 T4 3.7 Mustangs to T4

#37188 from Scotty B White · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, classify Ford Mustang V6 (05-14), as follows:

A specification table follows in the original; it is not shown here.

2024-12-01 T4 BMW 320i Spec Line

#37204 from chi ho · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, BMW 320i (14-15), change Notes as follows:
"**This Spec line will expire 12/31/24, Please submit to appeal** Turner Motorsports intercooler #024703TMS02 allowed."

2024-12-01 T4 MX5 2006-2015 NC Help

#37221 from Richard Mooney · Rule change · TB 24-12 (2024-12 Fastrack)

Thank you for your letter. Please see changes in letter #37281 in current Fastrack.

2024-12-01 T4 Classification for a 2005 Cadillac CTS 3.6 liter 6 speed manual

#37224 from Timothy Nash · Rule change · TB 24-12 (2024-12 Fastrack)

In T3 Spec Lines, classify Cadillac CTS (02-07) as follows:

2024-12-01 T4 Civic SI in T4

#37248 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, Honda Civic Si (06-11), change as follows:
Required Restrictor: "55mm flat plate restrictor required."
Min Weight: "2950 2900"
Notes: "The following items must remain stock: transmission differential - unless specified below. 55mm flat plate restrictor
required. LSD IS PERMITTED ACCORDING TO CATEGORY RULES"

2024-12-01 T1 Increased Bore Throttle Bodies for E46 M3 S54 Engine

#37273 from Mark Pfeffer · Rule change · TB 24-12 (2024-12 Fastrack)

In T1 Spec Lines, E46 M3 Spec Line # 1050, add to Engine Notes the following:
"Dinan Throttle Body #D760-3400 allowed on the 3.250L."

2024-12-01 T4 2006-2015 T4 NC Mx5 spec line

#37278 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), change Notes as follows:
"Factory bolt-in roll bar/cross member may be removed to facilitate roll cage installation. MSR option permitted. Suspension
package permitted with a 100 lbs. weight increase that includes the following parts: front spring mount PT#-0000-04-5259, front
springs #0000-04-9700-08, rear spring mount PT#-0000-04-5258, rear springs #0000-04-9400-07, helper springs #0000-04-HLPR-
EB (optional), Swaybar kit – PT#-0000-04-5306-EB that includes (front sway bar kit PT#0000-04- 5306-FT, rear sway bar kit PT#-
0000-04-5306-RR), offset front camber bushing PT#-0000-04- 5407-NC. Mazda Motorsports cold air intake part #0000-06-5150-
KT allowed. Mazda Motorsport RX8 rear Hub Conversion kit part number 0000-04-5811-KT allowed, RX8 front hubs PT# F189-33-
04X allowed. The SM5 suspension (only) is allowed with a 100 lbs. weight increase. Allow Mazda header part numbers 0000-06-

Applies to Mazda MX-5 on this page: Oscar Jackson

2024-12-01 T4 ND MX-5 wheel allowance

#37279 from Josh Smith · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Wheel Size as follows:
"17 x 7.5"

Applies to Mazda MX-5 on this page: Oscar Jackson

Applies to Mazda Miata on this page: Kristina Etherington, Kayla Etherington

2024-12-01 T4 T4 BOP

#37281 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change as follows:
Required Restrictor: "60mm 59mm"
Weight: "3125 3200"
In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), change weight as follows:
"2600 2550"

Applies to Mazda MX-5 on this page: Oscar Jackson

2024-12-01 T4 Allow 7.5

#37286 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)

In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), change Wheel Size as follows:
"17 x 7.5"

2025-01-01 AS Increase Coyote Engine Restrictor to 80mm

#36177 from Gregory Eaton · Rule change · TB 25-01 (2025-01 Fastrack)

In AS Spec Lines, add to Notes as follows:
Ford mustang (GT 05-14): "Gen 1- 67mm Gen 2-64mm"
Ford mustang (GT 05-14): "Gen 1- 67mm"
Ford mustang (GT 15-17): "Gen 1- 67mm"
Ford mustang (GT 94-04): "Gen 1- 67mm Gen 2-64mm"
Ford mustang cobra & Cobra R Mercury Capri (79-93) (79-86): "Gen 1- 67mm Gen 2-64mm"

2025-01-01 AS Performance Pack for 2015+ Mustang

#36867 from Michael Kamalian · Rule change · TB 25-01 (2025-01 Fastrack)

In AS Spec Lines, Ford Mustang Coupe GT (05-14) Restricted Prep., change Notes as follows:
"The 4.6L engine assembly has a weight reduction of 300 lbs. 5.0L/6spd engine/trans: track pack front and rear spoiler allowed."
In AS Spec Lines, Ford Mustang Coupe GT (05-14) with Restricted Prep. engine, change Notes as follows:
"Max. Wheel Size: Dia.18.0 inches. Stock brakes or alternate Ford 14” Brembo Brake (Ford Racing Kit #M-2300-S) and full prep
brake package may be used. Either engine may be used. 1st Generation 5.0l Coyote 11-14 62mm FPR 2nd Generation 5.0l
Coyote 15-17 61mm FPR Cold Air Intake allowed Charge Motion Control Valves can be blocked off and removed for firewall
clearance Allow Cold Air Intake Tremec Magnum transmission may be used P/N- TUKT16901. Full Prep Transmissions rule
package may also be used. Max compression ratio, 11.2:1 track pack front and rear spoiler allowed. Alternate transmission

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe, Pratt Cole

2025-01-01 T4 2016-2018 Mazda Miata MX5

#37085 from Nic Piekarski · Rule change · TB 25-01 (2025-01 Fastrack)

In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Min Weight as follows:
"2650 2575"
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), add to Notes the following:
"Mazda header 0000-06-5410 allowed."

Applies to Mazda MX-5 on this page: Oscar Jackson

Applies to Mazda Miata on this page: Kristina Etherington, Kayla Etherington

2025-01-01 AS Gear Ratios

#37131 from Timothy White · Rule change · TB 25-01 (2025-01 Fastrack)

In AS Spec Lines, change Gear Ratios as follows:
Cadillac CTS-V (04-07):
"2.97, 2.07, 1.43,1.00, 0.84,0.56 or 3.01, 2.07, 1.43, 1.0, .84, .57 or 2.20, 1.64,1.28,1.00 or 2.88, 1.91, 1.33, 1.00"
Chevrolet Camaro, Pontiac Firebird (70-81), Full Prep:
"3.42, 2.28, 1.45, 1.00 or 2.95, 1.94, 1.34, 1.00, 0.73 or 3.35, 1.93, 1.29, 1.00, 0.61, or 2.20, 1.64,1.28,1.00 or 2.87,1.89,1.28,1.00"
Chevrolet Camaro, Pontiac Firebird (70-81), Restricted Prep.:
"3.42, 2.28, 1.45, 1.00 or 2.95, 1.94, 1.34, 1.00, 0.73 or 3.35, 1.93, 1.29, 1.00, 0.61, or 2.20, 1.64,1.28,1.00 or 2.87,1.89,1.28,1.00"
Chevrolet/Pontiac Camaro & Firebird (82-92) Full Prep:

2025-01-01 AS ECU specs for LS engine

#37208 from Gary Mathews · Rule change · TB 25-01 (2025-01 Fastrack)

In AS SPEC LINES, Cadillac CTS-V (04-07) Restricted Prep., change Notes as follows:
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of the
stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Tremec TR6060
Transmission with 3.0 1, 2.07, 1.43, 1.0, .84, .57 ratios permitted. 11” wide wheels can be used until 3/1/25. Any ECM may be
used."
In AS SPEC LINES, Chevrolet Camaro, Pontiac Firebird (70-81) Restricted Prep ., add to Notes as follows:
"Any ECM may be used."
In AS SPEC LINES, Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V-8 LS1, add to Notes as follows:

2025-01-01 T4 Remove spec lines that have expired

#37269 from Touring Committee · Rule change · TB 24-12 (2024-12 Fastrack)

In T2, Effective 1/1/2025, delete for following Spec Lines in their entirety:
"Acura TL SHAWD (10-13)
Audi S4 (12-14)
Audi S5 (13-14)
Audi TT RS (2018-)
Cadillac ATS-V (16-17)
Cadillac CTS-V (06-07)
Chevrolet Camaro SS (98-02)

2025-02-01 T1 T1 Parity Compared to GT4

#37170 from Tony Ave · Rule change · TB 25-02 (2025-02 Fastrack)

In T1 Spec Lines, change Weight and Restrictor Required as follows:
Mustang - Spec Line 1430
Weight: "3475 3600"
Restrictor Required: "65mm 60mm - FPR"
Corvette Spec Line 1190
Weight: "3450 3500"
Restrictor Required: "70mm 67mm - Flat Plate"
In T1 Spec Lines, delete Spec Line BMW # 1190 in its entirety.

2025-02-01 T1 Clarification of Request Approval #37273

#37399 from Mark Pfeffer · Rule change · TB 25-02 (2025-02 Fastrack)

In T1 Spec Lines, E46 M3 Spec Line # 1050, change Engine Notes as follows:
"Dinan Throttle Body #D760-3400 VAC Motorsports #VAC-TB-S54 allowed on the 3.250L."

2025-02-01 T1 C8 Corvette Facts

#37400 from Garry Crook · Rule change · TB 25-02 (2025-02 Fastrack)

In T1 Spec Lines, Chevrolet Corvette C8 (20- 23) - Includes Z51, Spec Line # 1210, change Min. Weight as follows:
"3600 3500"

2025-02-01 T1 Camaro Gen 5 Competitive Disadvantage

#37440 from Clark Nunes · Rule change · TB 25-02 (2025-02 Fastrack)

In T1 Spec Lines, Chevrolet Camaro Gen 5 (10-15) Including SS, Z28 Spec Line 1135, change Required Restrictor as follows:
"75mm 80mm - Flat Plate"

2025-02-01 T1 Tire Changes in the Rules for GT4

#37497 from Joe Rainey · Rule change · TB 25-02 (2025-02 Fastrack)

In T1-GT4 Spec Lines, Audi R8 GT4 Spec Line #4020, change Max Tire Size as follows:
"315 DOT, 305/645, or 30/65-18 (f), 33/68-18 (r) Non-DOT"

2025-02-01 T4 Ford Mustang V6 (05-14)

#37516 from Touring Committee · Rule change · TB 25-02 (2025-02 Fastrack)

In T4 Spec Lines, Ford Mustang V6 (05-14), change as follows:
Final drive: "3.45"
Notes: "GT/CS front bumper cover #AR3Z-17D957-BA, allowed if used with front fascia."

2025-02-01 T4 Request to Classify Club Spec in Appropriate Touring Classes

#37523 from Andrew Benagh · Rule change · TB 25-02 (2025-02 Fastrack)

In T3 Spec Lines, classify Ford SCCA Club Spec Mustang (CSM) as follows:

A specification table follows in the original; it is not shown here.

Applies to Mazda MX-5 on this page: Oscar Jackson

2025-03-01 T1 Correct and make new T1 BOP adjustments.

#37737 from Touring Committee · Rule change · TB 25-03 (2025-03 Fastrack)

In T1 Spec Lines, change Weight, Restrictor Required and/or Notes as follows:
Mustang - Spec Line 1430:
Restrictor Required: "60mm 65mm - FPR"
Mustang - Spec Line 1460:
Weight: "3425 3500"
Restrictor Required: "70mm - FPR"
Corvette Spec Line 1190:
Restrictor Required: "67mm 70mm - Flat Plate"

2025-03-01 AS Race memo

#37902 from American Sedan Committee · Rule change · TB 25-03 (2025-03 Fastrack)

In AS Spec Lines, change Notes as follows:
Cadillac CTS-V (04-07) Restricted Prep. 6.0L V8 (Aluminum block, Aluminum heads), LS2, 2 valves/cylinder:
"Any ECM maybe used."
Chevrolet Camaro, Pontiac Firebird (70-81) Restricted Prep. 6.2L V8 (Aluminum Block, Aluminum Heads), 2 valves per cylinder:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (82-92)s 5.7L V-8 LS1 (Aluminum Block, Aluminum Heads) 2 valves per cylinder:
"Any ECM maybe used."
Chevrolet/Pontiac Camaro & Firebird (93-02):

2025-04-01 AS Flotek Head Plunge Cut Inconsistencies

#37502 from Pamela Richardson · Rule change · TB 25-04 (2025-04 Fastrack)

In GCR, Section 9.1.6., replace Figure 1 Value Seat Cutting Dimensions with the following:

2025-04-01 AS Notes clean up

#37693 from American Sedan Committee · Rule change · TB 25-04 (2025-04 Fastrack)

In AS Spec Lines, change/add to Notes as follows:
Cadillac CTS-V (04-07):
"Fuel cells must be located within 24 inches of the standard tank. The 24 inch measurement is taken from the perimeter of the
stock and alternative fuel cell. Fuel filler location is unrestricted with installation of a safety fuel cell. Any ECM maybe used. The
Drive Shaft Shop, Axle shaft part #'s 510220/510221 permitted."
Chevrolet Camaro, Pontiac Firebird (70-81) Full Prep:
"Engine built to A/S Build Sheet specifications with the following: Head Casting #s: 14101081, 14014416 Port Volume (Max.): 081
casting: 170.00 cc IN/65.00 EX; 416 Casting 168.00cc IN/60.00 EX with a 250 lb. weight reduction. Edelbrock Cylinder Head Part

2025-04-01 T1 Cadillac CT4-V Blackwing

#38003 from Touring Committee · Rule change · TB 25-04 (2025-04 Fastrack)

In T1 Spec Lines, classify Cadillac CT4-V Blackwing as follows:

A specification table follows in the original; it is not shown here.

2025-05-01 T1 Acceptance of Porsche 981 GT4 Clubsport into T1

#36664 from John Brown · Rule change · TB 25-05 (2025-05 Fastrack)

In T1-GT4 Spec Lines, classify Porsche 981 GT4 Clubsport as follows:

A specification table follows in the original; it is not shown here.

2025-05-01 T1 Request to Restore T1 Honda S2000 to Proper Weights

#37644 from David Mead · Rule change · TB 25-05 (2025-05 Fastrack)

In T1 Spec Lines, Honda S2000, Spec Line 1530, change as follows:
Minimum Weight: "2950 2900"
Chassis Notes: "This spec line is set to expire as of 12/31/2025 if not represented in Majors competition in 2025."

2025-05-01 T1 DCT Transmission in E46

#37964 from Matt Spicuzzi · Rule change · TB 25-05 (2025-05 Fastrack)

In T1 Spec Lines, BMW E46 M3, add to Chassis Notes the following:
SL# 1060: "BMW #GS7D36SG transmission permitted as an aftermarket sequential option."
SL# 1070: "BMW #GS7D36SG transmission permitted as an aftermarket sequential option."

Applies to BMW M3 on this page: Ian Barberi

2025-05-01 T4 Correct Ring and Pinion Ratio to T3, Sorry I Mean T4 3.7 V6 Stang

#38041 from David Mead · Rule change · TB 25-05 (2025-05 Fastrack)

In T4 Spec Lines, Ford Mustang V6 (05-14), add to Notes the following:
"GT 8.8 rear axle assembly allowed. 3.45 or 3.55 final drive ratio allowed. 7.5 rear axle assembly with 3.45:1 final drive allowed."

2025-05-01 AS Errors and Omission

#38055 from American Sedan Committee · Rule change · TB 25-05 (2025-05 Fastrack)

In AS Spec Lines, Ford Mustang GT 5.0l (15-17), Flat Plate Restrictor Size, change as follows:
"67mm 64mm"

2025-05-01 T4 T4 Mustang

#38058 from Scotty B White · Rule change · TB 25-05 (2025-05 Fastrack)

In T4 Spec Lines, Ford Mustang V6 (05-14), add to Notes as follows:
"OEM style rear deck spoiler similar to Laguna/CS packages permitted.”

2025-05-01 T1 Reduce E92 M3 Minimum Weight to 3050

#38092 from Shane Brown · Rule change · TB 25-05 (2025-05 Fastrack)

In T1 Spec Lines, BMW M3 E92 (08-13), Spec Line 1100, change Min. Weight as follows:
"3350 3300"

2025-05-01 T1 Finalize Spec Line for T1 Darkhorse

#38106 from Touring Committee · Rule change · TB 25-05 (2025-05 Fastrack)

In T1 Spec Lines, Mustang Darkhorse R (Mustang Challenge) Spec Line- 4119, change as follows:
Tire size: "305 315 (f) 315(r)"
Performance Control: "TBD"
Min. Weight with driver (LBS): "10.5 (f) 11 (r) 3600"
Chassis Notes: "Must conform to Mustang Challenge Rules. Tires conforming to Mustang Challenge rules are permitted. **This
car is not eligible for the Runoffs until it has competed in 3 Super Tour events.**"

2025-05-01 AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO

#38197 from Jim Clark · Rule change · TB 25-05 (2025-05 Fastrack)

In GCR, Section 9.1.6.F., add the following to Intake Part #’s:
"17113697, 19418185, 89017230, 89017363, 89017364, and 89017365, 12561269 and 88894095"

2025-06-01 T4 T4 Mustang

#38059 from Scotty B White · Rule change · TB 25-06 (2025-06 Fastrack)

In T4 Spec Lines, Ford Mustang V6 (05-14), change as follows:
Final Drive: "3.45 or 3.31"
"Weight: "3400 3300"

2025-06-01 T4 SSC tire allowance

#38216 from Benjamin Bunk · Rule change · TB 25-06 (2025-06 Fastrack)

In T4 Spec Lines, Scion FR-S Solo Spec Coupe (13-16), change Notes as follows:
"Any 200TW 225/45/17 or 215/45/17 DOT tire permitted."
In T4 Spec Lines, Subaru BRZ Solo® Spec Coupe (13-16), change Notes as follows:
"Any 200TW 225/45/17 or 215/45/17 DOT tire permitted."

Applies to Scion FR-S on this page: Tony Kiratsous

2025-06-01 AS Errors and Omissions

#38234 from American Sedan Committee · Rule change · TB 25-06 (2025-06 Fastrack)

In AS Spec Lines, Ford Mustang GT (05-14) with Restricted Prep Engine, add to Gear Ratios the following:
"or 3.66, 2.43, 1.69, 1.32, 1.00, .65"

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe, Pratt Cole

2025-07-01 AS RE: Previous Letter 37695 Update

#38245 from Michael Kamalian · Rule change · TB 25-07 (2025-07 Fastrack)

In AS Spec Lines, Ford Mustang GT 5.0 (2018-), change Weight as follows:
"3600 3525"

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe

2025-07-01 T4 Allow B-Spec cars to run in T4

#38439 from Derrick Ambrose · Rule change · TB 25-07 (2025-07 Fastrack)

In GCR, Section 9.1.9.2, Touring car eligibility, change as follows:
"Touring car eligibility: Cars are eligible for the class they are listed with a specification line and with the specific allowances
permitted. In addition T2-T4 cars may race one class up in touring classes above their specification line class as long as they are a
legal T2-T4 car and conform to their specification line allowances as classified. Cars conforming to B-Spec or C-Spec rules are
permitted to compete in Touring 4."

2025-08-01 T4 Incorrect Touring Heading

#38451 from Terry Hanushek · Rule change · TB 25-08 (2025-08 Fastrack)

In T2-T4 Spec Lines, change Table Header as follows:
"T2 ET"

2025-11-01 AS Cadillac CTS-V BOP Weight Change

#38640 from Alex Lozano · Rule change · TB 25-09 (2025-09 Fastrack)

In AS Spec Lines, Cadillac CTS-V (04-07) Restricted Prep., change Weight as follows:
"(Effective 11/1/2025) 3450 3400"

2025-11-01 T4 02-06 Mini Cooper Gear Ratios

#38966 from Trenton Kramer · Rule change · TB 25-11 (2025-11 Fastrack)

In T4 Spec Lines, Mini Cooper S R53 (02-06), change Gear Ratios as follows:
"12.79, 7.79, 5.65, 4.62, 3.83, 3.13 or overall- 11.42, 7.18, 5.39, 4.40, 3.65, 2.96"

2025-11-01 T4 Reinstatement of the 2005-2010 Cobalt into T4

#38987 from Tim Little · Rule change · TB 25-11 (2025-11 Fastrack)

In T4 Spec Lines, classify Chevrolet Cobalt SS, Sport Coupe (06-10) as follows:

A specification table follows in the original; it is not shown here.

2025-11-01 T4 Request to Classify Mercedes C230K

#39080 from Patrick Morgan · Rule change · TB 25-11 (2025-11 Fastrack)

In T4 Spec Lines, classify Mercedes C230 Kompressor (2002-2005) as follows:

A specification table follows in the original; it is not shown here.

2025-11-01 T4 ND Gearset Request for T4

#39166 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)

In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), add to Notes the following:
"Gear kit Kit PT#- 0000-02-6100."
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), add to Notes the following:
"Gear kit Kit PT#- 0000-02-6100."
In T3 Spec Lines, Mazda MX-5 Miata (16-18), add to Notes the following:
"Gear kit Kit PT#- 0000-02-6100."
In T3 Spec Lines, Mazda MX-5 Global Cup Miata (2016-2021) ND1, ND, add to Notes the following:
"Gear kit Kit PT#- 0000-02-6100."

Applies to Mazda MX-5 on this page: Oscar Jackson

Applies to Mazda Miata on this page: Kristina Etherington, Kayla Etherington

2025-11-01 T4 E&O wheel size on ND

#39168 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)

In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Wheel Size (in.) as follows:
"17 x 7.5"

Applies to Mazda MX-5 on this page: Oscar Jackson

Applies to Mazda Miata on this page: Kristina Etherington, Kayla Etherington

2025-11-01 T4 ND Spec Lines Wrong PT#'s

#39170 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)

In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), change Notes as follows:
"Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must remain
stock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from moving
action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including
Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r) sway bars
allowed. 3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804-02,
0000-02-5804-01). Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs
#0000-04-9700-08, springs up to 500lb front and 300lb rear allowed. Mazda tower brace 0000-04-5626 allowed. Mazda header

Applies to Mazda MX-5 on this page: Oscar Jackson

Applies to Mazda Miata on this page: Kristina Etherington, Kayla Etherington

2025-11-01 T4 Touring 4 Post-Runoffs BOP Adjustments and Changes

#39251 from Touring Committee · Rule change · TB 25-11 (2025-11 Fastrack)

In T4 Spec Lines, Acura RSX/ RSX Type-S (02-06), change Restrictor as follows:
"55mm FPR"
In T4 Spec Lines, Acura TSX (2004-2008), change Restrictor as follows:
"47mm FPR 52mm FPR"
In T4 Spec Lines, BMW Z4 2.5L (03-05) , change Weight as follows:
"3050 2950"
In T4 Spec, BMW 320i (14-15), remove this spec line in its entirety.
In T4 Spec Lines, BMW 323 (98-00), change as follows:

Applies to Mazda MX-5 on this page: Oscar Jackson

2025-12-01 AS 1994 Mustang Spec Line Request

#39104 from Barry Borgschatz, Jr · Rule change · TB 25-12 (2025-12 Fastrack)

In AS Spec Lines, Ford Mustang GT(94-04) with Restricted Prep Engine, add to notes the following:
"Ford Motorsport #M-6250-F303 camshaft is permitted."

Applies to Ford Mustang on this page: Roger Eagleton, Ross Murray, Matt Lituchy, Michael Lowe, Pratt Cole

2025-12-01 T4 Classing 1995-99 Dodge Neon SOHC

#39285 from Preston Obremski · Rule change · TB 25-12 (2025-12 Fastrack)

In T4 Spec Lines, classify Dodge/Plymouth Neon ACR SOHC/DOHC (2/4 door) (95-99) as follows:

A specification table follows in the original; it is not shown here.

2025-12-01 T1 Keep S2000 Classification

#39344 from David Mead · Rule change · TB 25-12 (2025-12 Fastrack)

In T1 Spec Lines, Honda S2000, change as follows:

2025-12-01 T1 Correcting and updating T1 GT4 spec lines

#39394 from Touring Committee · Rule change · TB 25-12 (2025-12 Fastrack)

In T1-GT4 Spec Lines, change as follows:

A specification table follows in the original; it is not shown here.

2025-12-01 T1 BOP adjustments to non GT4 T1 cars

#39406 from Touring Committee · Rule change · TB 25-12 (2025-12 Fastrack)

In T1 Spec Lines, change as follows:
Spec Line # 1134
Required Restrictor: "61mm 70mm - Flat Plate"
Spec Line # 1140
Required Restrictor: "72mm - Flat Plate"
Spec Line # "1175"
Maximum Displ.: "L76 5967cc OEM"
Minimum Weight: "3250"

2025-12-01 T1 Remove T1 Spec Line

#39407 from Touring Committee · Rule change · TB 25-12 (2025-12 Fastrack)

In T1 Spec Lines, BMW M3 E92 (08-13) Spec Line number 1090, delete Spec Line in its entirety.

2026-01-01 T4 Alternate Placement of Fuse Panel and Electronics Request

#39370 from Aaron Stehly · Rule change · TB 26-01 (2026-01 Fastrack)

In GCR, Section 9.1.9.2.D.9.d, add the following:
"8. Under-dash electronics including computers, modules and fuse boxes may be relocated so they can be easily accessed after
roll cage installation."

2026-01-01 AS Restrictor Plate Change for Gen 2 Ford Coyote Engine

#39501 from American Sedan Committee · Rule change · TB 26-01 (2026-01 Fastrack)

In AS Spec Lines, change Restrictor as follows:
Ford Mustang Incl. Cobra and Cobra R (79-93) and Mercury Capri (79-86) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang GT (94-04) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang Coupe GT (05-14) Restricted Prep 5.0L/6 speed 4 valves per cylinder: "64 mm 61 mm"
Ford Mustang GT (05-14) with Restricted Prep Engine: "64 mm 61 mm"
Ford Mustang GT 5.0L (15-17) Restricted Preparation: "64 mm 61 mm"

2026-01-01 T4 Clarify T4 Brake Rotor Allowance

#39503 from David Mead · Rule change · TB 26-01 (2026-01 Fastrack)

In GCR, Section 9.1.9.2.D.6.a.6., change as follows:
"In T2-Performance alternative rotors, including 2 piece rotors are permitted. Rotors must be within 5% of OE diameter or a
maximum diameter of 360mm.
In T3- Performance alternative rotors, including 2 piece rotors are permitted with a maximum diameter of 360mm.
T4- Performance alternative 1-piece rotors are permitted but rotors must meet the sizes listed in the spec line. Spec lines
showing alternate brake kits are also permitted to use 1-piece performance alternative rotors of the same size."

2026-01-01 T1 additional T1 adjustment

#39520 from Touring Committee · Rule change · TB 26-01 (2026-01 Fastrack)

In T1 Spec Line, Spec line # 1132, change Restrictor as follows:
"70mm - Flat Plate"

2026-02-01 AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request

#39055 from Jason Smith · Rule change · TB 26-01 (2026-01 Fastrack)

In GCR, Section 9.1.6.D.2.h.2., add the following:
"(Effective 2/1/2026) i. Weight based on full preparation chassis choice spec line for GM LM7 5.3L
Carburetor Option:
Must use the full prep 4776 holly carburetor and spacer gasket
Edelbrock Performer RPM 71187 intake manifold
MSD 6014 ignition box
(Edelbrock part # kit 7118)"

2026-02-01 T4 T4 and T3 Feedback

#39230 from Tim Myers · Rule change · TB 26-02 (2026-02 Fastrack)

In T4 Spec Lines, remove Ford Mustang V6 (05-14) in its entirety.

2026-02-01 T4 T4 Mustang 4.0

#39489 from Scotty B White · Rule change · TB 26-02 (2026-02 Fastrack)

In T4 Spec Lines, Ford Mustang V6 (05-10), change as follows:
Tire: "245 255"
Notes: "ABS (option code 552) allowed. FR3 Handling Pack #M-2007-FR3V6 allowed (kit does not need to be run in its entirety).
The kit includes: Dampers M-18000-A, Lowering Springs M-5300-N, Sway Bars M- 5490-C, Strut Tower Brace M-20201-F. Ford
Positraction LSD part #M-4204-C75 is allowed. Any springs max F: 500 and R: 400 permitted. Any sway bar up to F: 35mm and R:
28mm permitted. Aftermarket Shocks conforming to T4 rules allowed. Panhard bar, part # BAR-M-4264-A permitted, or any pan
hard bar permitted must be set at same length as a stock bar, center mounting hole to center mounting hole +/- 0.25 inch. An
alternative steel drive shaft is permitted; this drive shaft is otherwise unrestricted, but no modifications to other components

2026-02-01 T4 Allow Alt Bushing Material in Toe Links

#39607 from David Mead · Rule change · TB 26-02 (2026-02 Fastrack)

In GCR, Section 9.1.9.D.5.a.1., change as follows:
"T2-T4: A maximum of 3.5 degrees of negative camber is allowed on front and rear suspensions. Spec line part(s) may not be
modified to increase caster and camber. Strut suspensions may adjust camber and caster by the use of eccentric bushings,
eccentric bolts (crash bolts) at the strut-to-spindle, and/or by use of slotted adjustment plates at the top of the strut mounting
plate. If upper strut slotted adjustment plates are used, they shall be located on existing chassis structure, utilizing the
unmodified manufacturer’s original bolt holes and may not serve as reinforcement for that structure. Slotted adjustment plates
(strut camber plates) may incorporate a single spherical bearing (spherical bushing) and a ball thrust bearing per strut tower. On
other forms of suspension, camber and caster adjustment may be achieved by the use of shims and/or eccentric

2026-02-01 T1 LS1 into Corvette C6 Spec Line Request

#39716 from Danny Kellermeyerhttps://crbscca.com/secu · Rule change · TB 26-02 (2026-02 Fastrack)

In T1 Spec Lines, reinstate Spec Line # 1139, Chevrolet Corvette C6 (05-13) Includes Z51, GrandSport, Z06, Z06 Carbon, as
follows:
Max Displ: "LS1, LS6 OEM"
Min Weight: "3200"
Required Restrictor: "70mm"