Quote:
Originally Posted by MRCUR
BMW has issued a new recall for rear sub-frame bolts and notes in the letter to owners that you may hear a noise coming from the rear axle. They note if you hear the noise you should stop driving immediately and have the car towed to the dealer.
See here: http://f87.bimmerpost.com/forums/sho....php?t=1316931
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I don't have an M2 (yet) and have never heard the noise other than listening to the video, but this appears to be a plausible explanation. If a subframe bolt was loose and there is flexing it would cause the bolt threads to rub as it traveled up and down. That would explain the soda can crunch sound.