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Old 04-30-2011, 12:11 PM   #10 (permalink)
EcoModding Lurker
Join Date: Apr 2011
Location: Tucson, AZ
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If you keep the stock tubing size and don't go to a bigger diameter pipe you should be fine with changing the muffler. Depending on how many miles you have on your truck I would look at changing your O2 sensors. They can have a huge effect on FE.
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