Yeah, they will do it at no cost to you. Both mine and my brothers were out of the original warranty (although I do have the extended warranty but my brother doesn't), and they took care of them both (about a 20-minute job for them). It sounds like their fully aware of the problem at your dealership and will have you covered.Dude, it's friggin funny you mention that. There actually is a crease in the back end of the muffler. A very noticeable one. I didn't think too much about it. But now I have to consider that as well. If its replaceable under warranty, I need to get that done asap.
Keep us advised of the end results of everything and good luck.