I've found that most of the wind noise seems to be from the sunroof, even when it's closed. If you close the sun shade, it gets even quieter.
Yeah, I just turn the tunes up...

It's a great ride at most any speed. Gotta love it.
After all, it was designed with the autobahn in mind.

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2008 4.8i X5 (2/25/08) 105k:
Titanium Silver/Black; All -HUD; Aero Kit; 22" VS-130 w/Pirellis;
///M Shifter & Fr Brakes; Gauge Rings; Console Pads; Custom Wheel & Mats; Roof Rails
Carbon Fiber: Int Trim, Nav Surround, Grill, Cluster Trim, Shifter & Eyelids
1.2" H&R; LUX AEs; LCI Tails; Rear Fogs; NBT EVO; ESS Tune; Meisterchaft GTC Exhaust