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			It is a sound abatement device to comply with anticipated noise level legislation in europe, particularly switzerland. 
 
The Boxster is a world platform and so Porsche used it on all models rather than designing and manufacturing a separate piece for the US market. Similar to many other pieces in the car such as rear fog lights, etc. 
 
Cheers!
		 
		
		
		
		
		
		
			
		
		
		
		
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