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Here's what I can say: I just traded in a 2009 M3 E93 that did _not_ in any way make this noise for a 2013 E92 M3 that does make this noise.
It sounds kind of cool to me -- but I've noticed it when walking around the car when it's idling, when revving in a tunnel or driving next to a wall. The other M3 I had did not make the noise. I figured it was something to do with the newer, younger engine sounding better.
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