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			I'd say nowadays, it's probably a combination of "to be different," and to acknowledge the Porsche brand heritage of it traditionally being that way.  (And thus, even though the modern -- starting with our 986 Boxsters -- water-cooled Porsches don't share any parts with the earlier air cooled models, they are still both Porsches.)
		 
		
		
		
		
		
		
		
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