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Old 10-01-2009, 08:40 PM
new2u new2u is offline
Officially Welcomed to the 'Fest
Location: Vancouver, BC, Canada
 
Join Date: Sep 2009
Posts: 172
Mein Auto: 2006 X3 3.0i
My 06 had the almost same problem. Here's what my dealer did to repair it under warranty:
Cause: Exhaust Flap in Rear Muffler is making noise. Found a leak in the vacuum supply hose.
Correction: Replace vacuum hose. Road test, ok now.

After they replaced the vacuum hose, the exhaust drone noise at around 2000rpm near 80km/h(50 mph) is also gone. Hope this info is helpful.
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