On a related subject... would I see better results adding a Tonneau or truck cap? (would this be a better investment vs. the Muffler) I like the look of Tonneaus but the usability of the bed is reduced. would I see any gain from a cap or will the extra weight, drag, etc cancel it out. I saw the MythBusters episode...HaHa, but I don't remember them testing caps.
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