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			When driving my 98' Boxster with the top up and the radio off I hear a sound too.....but more like a "smooth whirring" when revving.  I've noticed for the past 22 years but I have always chalked it up to the mid-engine location (directly behind me) and sound deadening insulation/padding/carpet material. 
 
The car had 31,000 miles on it when I bought it and now has 102,000 (almost) trouble-free miles on it. 
 
I actually very much like the sound I hear....to me it's more of a gentle "whirring" than sounding like there is a problem.  I'm sure IF there was an issue sometime in the past 22 years I would have known about it......I just assumed ALL Boxster's made that pleasant sound.....lol
		 
		
		
		
		
		
		
			
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				98' Boxster
			 
		
		
		
		
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