You really need to hear different exhaust systems to know what you like. None of the options for the M are very cheap, so you want todo it right the first time. Lots of threads on this subject. Anyways, my 2 cents... I love my Akrapovic Evolution...nice sound, very little drone. Some systems are super loud...almost too much, but again, that is all opinionated, you need to hear them In person. I would attend a meet and hear all he different set ups.
2011 Le Mans Blue M3// Black extended Novillo w/ Blue Grey Aluminum trim/DCT/ZTP/ZCW/ZPP/ZCP Premium Sound ///Akrapovic Evolution Exhaust
2012 Le Mans Blue 135i M Pkg DCT
2013 Ford F150 FX4 Supercrew
Last edited by Rshane; 10-27-2012 at 12:32 PM.