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      12-25-2012, 12:08 PM   #17
dropstart67
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Drives: 2013 M5
Join Date: Sep 2012
Location: So Cal

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I believe it is normal drivetrain noise too. I hear it on my car and it reminds me of the gear "whine" you would hear on a sequential race transmission (like a Hewland or Xtrac). Gearboxes with straight-gears typically have this sound although its usually louder and more pronouced. I am not familiar with the gear design in the F10 M5 but I'm assuming its something similar. I know what you're talking about - most pronouced on a decel to a red-light at certain RPMs - and it's definitely not the active sound.