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			I have an 2002 boxster.  When I use the AC or heat, I notice almost no change in anything.   MAYBE I can hear more belts getting used, but I notice almost nothing affecting power.... well, accelleration is reduced slightly with AC, but I dont hear idles drop or anything. 
 
Just my input from my vehicle, and I know almost nothing about cars
		 
		
		
		
		
		
		
			
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				2002 Porsche Boxster
			 
		
		
		
		
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