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Speaking on this subject, per the F80post:
But, the good news is that we've confirmed with BMW Germany that it's a live amplification of the S55 engine's natural sounds. There is no artificially generated sound or pre-recorded track being played. This sound amplification takes place through the M3/M4/s stereo speakers.
Since it is part of the amplifier, this makes sense. That being said, I have not noticed it in my 2013 335.
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