Here's what a JB3 335i ( good friend of mine ) did to a stock M3 :
.
..link to the thread :
http://www.e90post.com/forums/showthread.php?t=171356 .
__________________
15 F82 M4,YMB-6MT
17 G30 540i,AW-8spd ZF
24 G82 M4C x-drive, DY-Dakar Yellow ind-8spd ZF