When I researched this in my area (a Northern Virginia suburb of Washington, DC) a couple years ago, I couldn't find anyone in the region who knew a thing about tuning our trucks. Nowhere in Virginia, DC, or Maryland. I actually considered driving to North Carolina, but instead did their "advanced exchange" program, where they send you a unit, plug it in, send them yours, they program it and send it back, then you return the loaner... this was the only way I could do it because my truck is my daily driver and I don't have any other vehicles. One of the options I specified was to turn off that lousy PassLock, that's always preventing people from starting their vehicles. I was a bit aprehensive about using the loaner but it worked great!