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I have a X1 xDrive 18D SE with 1000miles plus and have experianced the what I would call wind whistle at 120Kmph 75mph. It appears to be around the centre air vents, but closing these or opening them makes no differance. What does make a differnace is if a front window is partially opened, close the window and the noise come back. It certainly appears to be a resonace at a give speed relevant to the air density, however if its wet it does not give that wind whistle noise. Quite a problem, but with my engineering background I will track this down, it may take some time.
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