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Welcome to the internet's first duramax 6600 diesel discussion forum for the lb7, lly, lbz, lmm, lml, lgh & l5p rpo code engines Tips on performance, fuel economy, troubleshooting and more. What have you done to your 2.8l today 2.8l duramax onto ar5?/best efi live delete tune
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Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!
I bought a 2025 gmc sierra 1500 denali ultimate duramax and overall, i love the truck It's an absolute joy to drive, and the engine is fantastic Unfortunately, with barely 3k miles on the truck, i've had significant two issues that have required return trips to the dealer. Thank you all for being patient with us
2021 6.6 duramax what the heck is this sound L5p swap.anybody know diesel attitude L5p injectors require back pressure to operate
