humming noise

AUDI A4
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ASK2007
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high pitch humming noise at high speed(50 mph or more), but appears to disappear at even higher speed.
I think this is coming from bottom of the driver side and may have been started after car"inspection" about a month ago
any ideas?
Jul 11, 2007 at 10:28 AM
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ASK2007
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I forgot to mention that this is A4 Quattro 3.0
2005, 27000 miles, Audi of course
Jul 11, 2007 at 11:40 AM