Originally posted by h0ckeyplr
what would happen if you took out the exhaust, left the cat, and put a pipe from the cat back? Would it give any gains? Would it be illegal, here in california?
Well over the 95 db limit...so sound-wise it would be illegal. With the stock cat you should be fine...but you still have a bottleneck there. Replacing your stock cat with any aftermarket cat is illegal in CA (although most of them are smog-legal. Smog = pass, but a cop can still write up a fix-it ticket. doubtful it'll happen though).
Shingo