Originally Posted by ///MWorld
A buddy of mine had a custom exhaust system put on his 550i and it sounds amazing. I'm thinking about doing the same for my M3. Any opinions about custom exhuast systems?
I agree with PG that it's a science you don't want to trust your local muffler shop or tuner with. There are so many competent systems out there from reputable exhaust companies, I don't see the advantage, and see a lot of potential disadvantages.