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					Originally Posted by Qmulus  FWIW, here  is a good study of air filters.  I like tests with real data and there is a lot there.  Bottom line, there is no free lunch.  Interesting read if nothing else... | 
	
 
Check out this video. This car also has a flat 6 in it and got a 5.7+ whp with just the K&N filter added. Also the longer the K&N filter is in the car, the better it traps dirt.