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Originally Posted by PaoloX5
Had same problem. Dealer said it was a caused by an abnormal seal termination between windshield and roof. Dealer repaired it at no cost (under warranty that time).
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I had this issue on my M3. Examine the rubber seal surrounding the windshield and look for cracks or separation, or anything that air will get caught in at speed. It doesn't have to be big to make a lot of noise - all it has to do is disrupt the flow of air and create turbulence.