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None were duramax trucks, but ive gotten the pleasure of 5 and counting since ive started on gas vehicles that needed the flash back to stock after EFI live treatment. Not sure if its the same for...

EVERY vehicle i encountered tuned with EFI needs to get the PCM flashed back to stock by a dealer before HP tuners can even get into it. It corrupts the PCM with a really weird OS that nothing else...