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Are you running stock exhausts? If so, they do tend to have a bit of a "chuffing" or "whispy" / "airy" sound, due to their mechanical sound absorption manuf'g characteristics. A 'free flow' sound absorption system, such as on most of the performance exhausts offered, will tend to run a more realistic sound, w/out that "chuffing". I like the REMUS' I've run on all my Bimmers. Not too loud, but deep, and only loud when I throttle it hard. On the newest M3's (I only wish I could afford :-) they have two versions I believe. A Sport version and a Race version. If you are running an aftermarket system, some use that O.E.M. style baffled / chambered style of sound absorption, and may "chuff" a bit as well.
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