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      10-30-2019, 06:41 AM   #8
Bleser
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Drives: 2017 ///M3 6MT
Join Date: Dec 2013
Location: St. Louis, MO

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2017 BMW M3  [0.00]
Txipi84 and others -

I wanted to post here that I mentioned this noise to my dealer today while getting maintenance done (oil change, spark plugs, air filters) and they solved the mystery! There is a slatted cover to a vent system beneath the driver's seat. Coins can get down in there, and in my case the previous owner left me a dime and a penny in this area that were sliding around and you could hear them when decelerating / accelerating. Mystery solved, for me anyway.