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			The OD of the throttle body is the same on both.  The 2.5L one tapers down and uses a smaller butterfly. 
 
 
I really doubt that you would see much gain with a larger TB, but everyone thinks bolting different stuff on makes improvements, so to each their own. 
 
Todd
		 
		
		
		
		
		
		
			
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				Current Cars: 
1989 911 Targa 
1984 944 Original Owner 
1971 911T
			 
		
		
		
		
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