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Re: Are header helpful? 2006 Silverado 4.8l
Posted to Technical Theory Forum on 11/13/2012

Byron, you sound jaded. I have a friend who put on a Flowmaster muffler and a K&N filter and doubled his mileage. In fact he got better mileage than anyone he ever talked to because he asked what they got first.

Actually, you are spot on, I wholehearted... Login to read more.