Originally Posted by Denk
If you're uncertain about an exhaust, I wouldn't buy new. There's a good rotation of popular exhausts being sold here for almost 50% off list. Most of us try a few out before we get it right. Take some time to do some research here and on youtube to get an idea, that's a good place to start. Try to get together with local M3 peeps and check out exhausts in person. Good luck!
Wish I bought your Borla ATAK..