Stock cat diameter? - Third Generation F-Body Message Boards

carlo1170 · 09-11-2005, 01:50 AM

Hey guys,

I just purchased hedman shortie headers and the hedman ball flange y pipe which is 2.5 inlet and 2.5 outlet. I was wondering, what am i going to have to do to keep the stock cat. its wierd, because i have the stock cat on my car, but an aftermarket exhaust. Im not really even sure what diameter that is. but it is NO DOUBT way newer than say the y pipe is.
what do you guys suggest?

yes, my cat is gutted, so i'd rather just keep it and save money haha.

five7kid · 09-12-2005, 12:09 PM

If the 350 is the factory engine, then your cat inlet is 3".

If the 350 is not the factory engine, then we'd have to know what was.