All exhaust is a winner, but just beware of ASR! This thread says it all,
http://www.m5board.com/vbulletin/m5-...p-buy-106.html
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07 M6 blk/blk, Racing Dynamics RS58 stroker with custom ECU tune, Primary cat bypassed+Akrapovic Evolution exhaust, BMC air filters, RPI air scoops, H&R springs, Dinan FRC & rear sway bar, 20" AC Schnitzer V
08 E92 M3 sparkling graphite/red, Competition pack, Innotech exhaust