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Notice the sound got faster as you sped up but didn't change with RPM. The wind is catching something...
I'd consider getting a blower or compressed air and trying to find it that way.
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Retired 2016 BMW 550i xDrive MSport | 2013 BMW 550i xDrive MSport | 2012 BMW 535i xDrive | 1988 BMW 325ic | 1984 BMW 318i
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