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tune issue

  1. 11-16 LML Duramax Powertrain
    I have recently just bought my 1st diesel pick up truck. I noticed the truck smokes quite a bit but still had a dpf on it. I have drove over 1000 miles and the DEF still reads full, and there's cut welds on the DPF. I've come to the conclusion the DPF is gutted and the truck is tuned. I bought...
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