I recently purchased a 2014 GT from a dealership. I have a few mods I want to add including an SCT X4 tuner. When I try to connect the SCT X4 to change the rear end gear ratio, I get a Vehicle Unsupported. Along with a note that says MGMPBAA* contact technical support. The issue I ran into is the Mustang has a Ford Performance Power Upgrade Package M-FR1-MGTB. The upgrade came with a ProCal tuner. I do not have the handheld tuner, so I do not have access to the stock tune. I called SCT X4 and after a 45 minute wait they were absolutely no help, they said it has an aftermarket tune and hung up on me. I called Ford Performance and they said the only way to remove the tune is to have a dealership reflash the PCM. I have been to three Ford Dealerships and the last one was finally able to reflash the PCM (or so they say). I am still getting the same error on the SCT and the detected PCM strategy is the same as it was before MGMPBAA. My PCM is a BLV4 DR3A-12A650-ABE/ DR3A-12B684-BA PN: 5WY8908GFCE. Has anyone encountered this issue before?