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      04-03-2011, 11:26 PM   #8
svencz
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Drives: 2011 E90 M3
Join Date: Jul 2008
Location: SF Bay Area, CA

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The reason was an insufficient sealing of the windshield. The dealer removed the windshield, replaced the sealing and the noise is all gone. Both me and their techs though the noise was coming from the dashboard, only after they removed the dashboard completely and were still able to reproduce the buzz they figured out it was the windshield.