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exhaust mileage

  1. 04.5-05 LLY Performance Parts Discussion
    I have a similar question. My parents just bought a used 05 2500HD Duramax Turbodiesel. Whoever had it before had just cut off the exhaust maybe a foot after 2 pipes come together. I didn't like that it was getting fumes around the truck at idle. I can't say it was that loud, but it was drowning...