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5150.4.67 · 04-14-2011, 12:08 AM

On a 2 barrel setup, none. 4 barrel maybe 10% more at best.... mpg will not likely change.

04-14-2011, 12:08 AM	#10
5150.4.67 Registered User Join Date: Dec 2007 Location: Modesto, Ca Posts: 411	Re: Header or Not To Header That Is The Question On a 2 barrel setup, none. 4 barrel maybe 10% more at best.... mpg will not likely change. Last edited by 5150.4.67; 04-14-2011 at 12:08 AM.