Here is how much MPG I get with my 2004.5 LLY Duramax extended cab long box 4WD with 5" MBRP straight pipe and 3" MBRP downpipe. 2400 mile experiment, see results at the end!

No tune or other performance mods.

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***This channel is for entertainment purposes only! Do not do what I do. Do not take my advice. I am not a professional. The methods I use may be completely wrong and/or dangerous. Please seek professional help with anything and everything and do your own due diligence (research). Working on cars is extremely dangerous. I am not responsible for any loss of life or limb or property. DO YOUR OWN RESEARCH. THIS CHANNEL IS FOR ENTERTAINMENT PURPOSES ONLY!***

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