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well last friday in replaced my stock muffler with a dynomax ultraflow, and since them ive noticed my gas guage drops alot less, and i havent changed my driving style at all, if anything ive gotten on it alittle more since then. Im over 250 MPG and still showing 1/2 a tank.
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i am about to get a muffler shop to run a set of true duals on my truck. prolly 18'' glass packs or straight pipes. i am interested to see if it effects my mileage.
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