E&O Single Inlet Restrictor abbreviation, etc.
#34369 from Club Racing Board · Rule change · TB 23-06 (2023-05 Fastrack)
In P1, GCR section 9.1.8.B.J.2, change as follows:
"Where a carburetor or fuel injection restriction is specified, a flat plate intake restrictor, restricted venturi, or Single Inlet
Restrictor (SIR) is required through which, all intake air for each cylinder or the entire fuel-air mixture, if prepared before this
point, shall must pass through the restrictor."