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				What’s a realistic hp gain
			 
			 
			
		
		
		
			Hi, just purchased a Racing Dynamics header, straight through mid pipe with two small resonators all coming to a Beluga (fab speed copy)    
 
I have read anywhere from negative hp to as much as 20+. The car is a 99 base model 2.5
		 
		
		
		
		
		
		
		
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