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				2010 X5 35d loud exhaust noise at 60mph
			 
 
			
			I have a 2010 X5 35d with 56k miles.  Recently it started making a really loud booming exhaust noise right at 60 MPH; well I think it's exhaust anyway.  It sounds similar to when you suddenly lift off the throttle when accelerating but much louder.  The strange part is that it is right at 60MPH, if I go a little above or a little below it goes away.  Anyone else have this problem?  Any clues as to what might be going on?
		 
				__________________2010 X5d, Space Gray, Tobacco, Premium, Tech, and rear climate packages, roof rails, spare tire, and iPod adapter.
 2006 330i, Sport, 6MT
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