You can't get the Ferrari/F1 sound because the M3 does not have a flat plane crank. Also, on the Internet it is impossible to get an unbiased opinion on an exhaust because everyone has their own opinion on what sounds good and it may or may not agree with yours. The best thing you can do is get with an M3 club meet and hear different exhausts personally to see what you like.
2011 Le Mans Blue M3// Black extended Novillo w/ Blue Grey Aluminum trim/DCT/ZTP/ZCW/ZPP/ZCP Premium Sound ///Akrapovic Evolution Exhaust
2015 Audi S4 Prestige, Brilliant Black S-tronic
2012 Le Mans Blue 135i M Pkg DCT