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How much do aftermarkets affect gas mileage?
April 5th, 2010
I have a 03 Z71 with a 5.3L engine and am thinking hmm. Gas mileage is not so great. How much would a cold air intake, exhaust and a programmer improv……click here to continue reading
I have a 03 Z71 with a 5.3L engine and am thinking hmm. Gas mileage is not so great. How much would a cold air intake, exhaust and a programmer improv……click here to continue reading