Even if it does, its not enough to really brag about. Ive had 2 hard shells and i never thought it really improved my MPG. I guess it would be the same as driving either with your tailgate off or down, but i agree with 88racing it does make it look smoother.
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40 series Flowmasters, K@N CAI, Jet MAF, Troyer Under Drive Pulleys, Stainless Works Longtube headers/Hi Flow CATS w/X-pipe, Ram Air Hood G-Force, SCT X3 programmer with custom tunes
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