i love my magnaflow muffler. i think it sounds great. but i have heard the ss's with around the same mod's running stock exhaust with just tailpipes and they run good and sound great.

 

I bet that cat is LO-CARB and high on protein.

 

Well....I don't think THAT particular cat has a CARB certification, and I'm not sure exactly WHERE you'd put an O2 sensor (and I don't really want to think about it either...I'm a cat lover)

but anyway....the 2500 exhaust has one cat in the divers side down pipe, and the passenger side cat is in the pipe attached to the muffler (kinda wierd looking actually but it was the only way GM could get the cats evenly spaced from the engine I think)