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  1. 2011 h&s mini max, egr, dpf, ccv delete mpg HELP!

    Performance Mods - Engine - Dodge Cummins Diesel
    I bought a 2011 cummins 4x4 and it already had h&s mini max and dpf delete 4" straight pipe. It only got about 15 mpg. I installed s&b cold air intake, sinister egr delete and 5" straight pipe w/ flow through muffler. My mpg went DOWN 1mpg!?!:4-dontknow: What could be the issue? I'm stumped! I...
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