Originally posted by wushu_civic
a lot of people have found that a lot of the aftermarket cat-backs for E46 M3s actually rob power. at least that is what i have heard. it makes sense. the e46s have already had most of the power possible squeezed out by bmw. also when you have 333 hp and ~260 lb. ft. you don't need that mush more power for the street. a lot of people get the exhausts for looks, or they spend their money on other things like suspension.
I'm sure asiandoood knew that.
h:
Btw, most BMW stock exhausts are free flowing anyway so the only point is getting an exhaust is for the sound.