Muffler delete is ok on the regular 3 series, but on a M3, it sounds bad. Go with a Magnaflow, Remus or Dinan muffler if you want a little louder than stock. Go with Agency Power, Eiseman, Groupe M, SuperSprint, and several others if you want considerably louder than stock. I would recommend you go to car meets and try to listen to other M3's that have aftermarket exhausts installed to get an idea. With the weather getting better and the car show season getting underway, you'll be able to audition a lot of exhausts.
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2003 TIAG Coupe / Blk Interior / SMG / HK Premium
EU-CSL Coded / Macht Schnell intake / OEM CSL Wheels / OEM CSL Diffuser / Dinan Exhaust
Full LED Conversion / HID fog / Aurora AE / RE RTAB FCAB