Originally Posted by DieselNuts
T2 class is basically a showroom stock class and doesnt allow for modification of the diameter of the inlet or outlet of the stock cat. They either replace the cat with a pipe of stock sized inlet or outlet or gut the cat completely
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h. Exhaust System1. All cars classified in T1,T2 and ST may replace the catalytic converter(s) with a pipe that has the same diameter inlet and outlet as the converter it is replacing. The post cata-lytic converter oxygen sensor may be disabled, replaced,
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GCR - 5699.1.10. Touring Category SpecificationsTCSor removed; the resulting hole (if present) may be plugged. All Touring cars may replace any part of the exhaust system beyond the catalytic converter(s), provided:a. Said replacement system retains the original configu-ration, e.g., single or dual, etc.b. The system exits from beneath the body in the same approximate location(s) as the original system. When a factory (OEM) single exhaust system is cosmetically split into dual outlets, it is permitted to continue as a single system provided it exits in approximately the same location as one of the originals.c. The system meets all appropriate event-specific sound level requirements
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