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Originally Posted by ChevyHighPerformance
If you understand how to do the tuning you'll know what to look for. With a Tech 2, I could tell if the programming is altered in about 1000 feet. Unless the tech has a reason to use the Tech 2, suspects a different program, and knows what to look for, you're safe.
I know Allen fom Nelson Performance. He has been programming for a while. We tested his programming for an article (i.e., mail tune) versus an in person tune and Allen did pretty well.
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You could, but 99 percent of all the techs out there can't or won't. They are working against the clock and hopefully, they will fix the problem.
My experience with pre-made up programs is they don't do a dang thing. The only way to go is with a custom program by a reputable programmer, or with some vehicles, spend a day on a dyno with an LS1 edit sitting on the passenger seat, or on the lap of the programmer.