first of all welcome to M3post.
second (i will save u the
: BS coz im sure others will be flaming you momentarily for not searching) hahah
here:
http://www.m3post.com/forums/forumdisplay.php?f=124
http://www.m3post.com/forums/showthread.php?t=109045
third idk what "proven best exhaust" mean