So I need to take my car back to stock for autox classing purposes. It came with the GMPP tune already on it. I checked tis2web to see what ECU Operating System they had on record for my VIN, and it's 12633831, which matches up to the GMPP tune for 2009 as I would have expected. What I'm wondering is this: how do I get the stock tune reflashed onto another ECU (intend to keep the GMPP ECU and sell), if the dealer shows the GMPP tune associated with my VIN? Is this something they can override at the dealership level (I'm guessing not), or do they need to escalate and inform GM that my GMPP tune is being uninstalled, and to update their records back to the stock ECU O/S? If anybody out there has done this, please get in touch with me. I want to make sure I don't waste my or the dealer's time trying to figure out who they need to talk to in facilitating this.