I think we could all benefit from a tune...
Went to the dealer yesterday to get first oil change at about 1000 miles, wanted sooner but whatever. Ordered a bunch of Amsoil for all the systems and wanted to use this a a flush. They give 1 free oil change and a tank of gas, but didn't want to do the oil change because it was too soon, but finally gave in. Anyway, talked to the Service Manger about mods, they're outlook on it was pretty good. He said a 4" high quality lift (CST) with 33s would not be a problem, they have warranty problems when guys come in with 7-10" and big tires. Told him I was putting GM Performance exhaust/intake and that I'd put a GM lift if they offered one, or let them install one if it helped. He said just let the CST do it, they just won't warranty the aftermarket parts but wouldn't try to void anyhing else. He even said that a tune would not void the drivetrain warranty unless it caused the failure, which is correct. Said just take it out if I bring it in. Told him I know GM is cracking down and can find evidence of it, but he said again he would not just void the powertrain warranty simply because I had one. Good news, hope he means it, but I think it really depends on the dealer, and if you talk it over and are friendly and sound like you know what you're talking about. Also told him I wanted only the best available everything, and wanted a tune mostly for optimized economy/performance, not just to strip away all the torque management and extreme parameters.