I just recently bought a 2007.5 duramax. It has a 5 position switch with a efi tunes. I have no idea what tune is what on the switch. I would also like to potentially edit one of the tunes so that it...
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I just recently bought a 2007.5 duramax. It has a 5 position switch with a efi tunes. I have no idea what tune is what on the switch. I would also like to potentially edit one of the tunes so that it...