Quote:
	
	
		
			
				
					Originally Posted by  tconnarn
					 
				 
				it sounds like someone blowing on a coke bottle. 
			
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A hum could be tire or bearing.
Swerve from side to side.  If the hum changes most likely it's a wheel bearing.
But, a Coke bottle sound could be a sign that the Air Oil Separator is going or gone.
Watch out for smoke coming out of the exhaust.  If it starts smoking don't keep driving.
Replace the AOS.
Happy Boxstering,
Pedro