Additional Clarification from Letter #34774 Intake Manifolds F600
#35766 from John Spitler II · Rule change · TB 24-04 (2024-04 Fastrack)
In F6, GCR section 9.1.1.D.15.F, change as follows:
"Carburetion or fuel injection may be used and must be stock and unmodified for the model and year of the engine that is used,
with no modifications to the intake system, including no use of fairings, funnels, venturis, or other structures of any kind in the
intake system above or below the intake restrictors. The use of any carburetor jets or needles is permitted. Stock air filters and
air boxes may be removed, and air filters and air boxes are unrestricted."