Originally Posted by Sirius Black
I went with AE Performance, and get many comments on how nice it sounds. Proir to that I did the Fabspeed Xpipe. The Xpipe made the stock system a good bit louder, so I can't really say how much the AE cans added. Check out some clips, you might like the tone.
+1 on AE..had their full system on a 335i and sounded amazing and was only $1500 for a full Downpipe back system..not too loud but a great sound..
For the M3 its $2K for just section 3..M3 tax?..IDK..but def too much money for what you get