Hey @Gearhead, i saw in a Coloradofans post you mentioned that the HO tune was now available for retail purchase, but had to be ordered from an "ADI".
1) what is an ADI?
2) I see it for sale from the dealers who also have internet sales sites, such as this:
https://www.gmpartsdirect.com/oem-pa...e-pkg-86577457 think that would work?
3) I have a GMC dealer right down the street, and Chevy dealers are 30+ mins. Think a GMC dealer could perform the tune flash?