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			The metal filters have paper inside. The insides of a normal spin-on filter look a lot like the paper element of the Porsche filter. 
 
Other than being able to buy less expensive spin-on filters at a local parts store, i'm not sure what the advantage would be.
		 
		
		
		
		
		
		
			
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				2003 Boxster S 
1995 Ferrari F355 Spider 
San Francisco, CA
			 
		
		
		
		
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