1996 Impala SS
Good luck finding that one PCM on that one car. That is the only one that can do it. Literally. The 04 GTOs had Holden OS.04 GTO ?
And yes I know HPTuners just destroys emissions laws. I have no idea why they won't let any PCMs run lean cruise. It is something in the logic. You have to have the .cax file.
It is diesel emissions tier hard.