I'm not sure if you're saying the sound is coming from the windshield or the passanger side window area. I had a terrible wind noice problem at around 80mph. I replaced my windshield wiper blades with Bosh Icons and have never had the problem since.

Before you run out and drop $$$ on Icons, I would simply remove the stock blades (wrap the arms with a piece of cloth) and go for a test drive. Thats how I figured it out.

Good Luck.

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Hers: 2005 X5 4.4

Mine: 1997 540
(way to many mods to list)