Its a extra thing he does to make it appear like a stock ecu. The dealer will never be able to tell it is tuned by their equipment by using common sense yes but not by their equipment.
apparently you haven't been around for awhile because their is a actual bulletin by GM telling dealers how to see if the ecu mapping has been modified or not. Also he asked what the invisitune option was on his site, I was explaining it. You don't need to be rude when I am just trying to be helpful.
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