[SVT ZX3]

Be very careful, especially if this is an Ebay sale, you can read my rant regarding my bad experience about this HERE, same thing applies to Xcal2's. You must make sure the former owner has flashed their factory Ford program back onto the car. If they haven't and they send it to you, it either has to go back to the original owner to be done or it has to go to SCT head office in Florida to have the memory wiped clean (unlocked), and it will cost you $150 USD to be unlocked. If the seller does their part and puts their car back to stock any SCT dealer can unlock it or you can even download a program to unlock it yourself (if you get the PC to Xcal2 cable as part of the deal). At this point the unit is ready to be programmed with a new tune. The short answer is no, its not just plug and play. It has to be reprogrammed regardless. As long as there are only aftermarket tunes on it your fine, if there is a stock Ford tune on it, it will be a giant PITA for you.