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M3 may have more rattles than the f30. at least my 2011 does. far stiffer suspension, heavier front end, and no extra insulation or materials to dampen the sound. the car is outright noisy with a regular 3er interior. i got a full exhaust to drown out the rattles but it made it worse, more vibrations. you may get lucky tho. gl.. read about rattles on m3post. there are two clear camps. Either they have it bad, like me, or they report nothing at all.
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