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Yup, if its stock, its unlocked. After youre done returning to stock, plug the tuner back in and the screen should flash saying tuner is not locked to vehical.
Good luck with the Mustang, they are fun cars for sure. Too bad a local guy can't swing by to swap wheels with you, plus maybe a couple of bucks for you to boot. I wish I had tires on my 16's, I might have taken a road trip.