[jamesm]

it's hard to argue that the shop should pay for this. i know it sucks, and i feel your pain, but once you're off the lot, it's all yours. unless you can prove without a doubt that something they did caused the failure (which is nearly impossible without pictures taken before the failure or something along those lines), the dealership can easily claim that the tune was to blame. they can also claim negligence on your part for not following accepted best practices (i.e. having a boost/afr gauge), or improperly breaking it in, any number of excuses.

ultimately, when we bolt this stuff onto our cars we accept the possible (unintended) consequences that come with all that fun. this is why it is so important to either know how to perform the work yourself, or know a good shop that you can trust to do quality work. dealerships generally aren't the spot.

i hope you get everything resolved in a manner that doesn't cause any hardship (financial or otherwise), but i'd be flat out shocked if you didn't end up paying the bill.