The M-M Act is great, but time after time dealers and reps violate it and unjustly deny warranty claims. This happens under every maker not just GM. In the end they can do what they want. Going to court over it is a long and expensive process. It doesn't happen all the time but often enough. I've seen it first hand. It was a huge problem with the '03 Cobra. Look at the car the wrong way and they were denying claims. Of course it didn't stop me from putting a pile of parts on my car while I still had paper plates but that's just me. Mod at your own risk.
2010 White/IOM Camaro 2SS/RS M6