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Thanks for taking the time to reply. Sounded like bulls#@t to me,the sad thing is the guy is a member of this forum. Its too bad some try to look better by giving bad info to others.

Hey guys, new to this, was told by a customer today that GM 6L have a unlock code? Sounds like a second factory tune built into the pcm, has anybody heard of this if so how do you flip the switch?...