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  1. EFI Live
    Hey guys I do have a Duramax, but this question is for my brother and his '04.5 LLY GMC. He has EFI Live and the Edge Monitor, He set his tune to 5 and was driving and the screen went black, he said a new screen is around $700 or so, but my/his question is, is there a way to change his tune back...
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