Hi, I recently bought a 2008 RL. I want to install the GMPP tune(I know there are better ones out there but I live in Cali and the other tunes aren't legal and the state is cracking down on tunes so I want to play the safe side.) I called around to 4 local Chevy Dealerships. None of them had any idea what I was talking about. Once I mentioned the cobalt ss upgrade, one of them found the existence of tune but info on how to preform it. I tried to explain the process but they said they didn't have anything to base it off of. Has anyone found a good GM dealership in Southern California to do the tune or at least has knowledge of it?