I have my stage 1 for almost a year now (First Batch)
I bought mine thru "Wykoffchrysler", I had to give them all the info including milage and VIN. I have taken my car for service three times and it has never been a problem, (I change PCMs just to make sure they don't flash the programinig
) I have placed the factory PCM many times back and it has never been a problem.
Go ahead and enjoy your stage 1, If you think the car may break on the road, just put the original PCM inside the pocket of the trunk with a 11MM wrench so you can swap it anywhere. It takes less than 5 minutes to swap them.
Ian