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mpgking · 04-30-2011, 01:11 PM

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.

04-30-2011, 01:11 PM	#10 (permalink)
mpgking EcoModding Lurker Join Date: Apr 2011 Location: Tucson, AZ Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	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.