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      10-07-2011, 08:42 AM   #11
Drives: 2011 M3
Join Date: Sep 2011
Location: Toronto

Posts: 964
iTrader: (0)

I had a faint howling noise on my 535 between 130 - 140km/h. Turns out it was tire/rim related. Once I switched to winter tires, the sound was gone. Try switching the tires and see what happens.
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