Email the ExhaustGuys @
streetofdreams2004@yahoo.com
Their one this board, and their great guys to deal with. I bought my magnaflow cat-back from them as well as numerous other members on this board. I think Kasey Savage_Messiah got a high-flow cat from them as well.
On Summit Racing a 3" Universal Cat-Co Catalytic Conveter goes for about $59.