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Old 07-28-2012, 12:38 PM
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BadHazard BadHazard is offline
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Default Installed a magnaflow now loss of mpg

I had a 3" straight pipe on, had to put a muffler on, bought a magnaflow straight through. I was getting a hand calculated 15 mpg before the muffler, now I barely brake 13. Its been on for about a year. Before the install my lie-o-meter was at 17 to 18, even that has dropped. Nothing else has changed.

Can a bad egr valve be a problem? Or isnt there another thing similar to that, that can cause mpg drop?
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06 QCSB, 1500, Laramie, 4x4 50k. 18" Rockstars, K&N Drop in Filter, Muffler Delete, SuperChip
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