The differences between the mtune and the mp215 tune is that the mtune comes with the mp215 tune programming, and more. It's tunes can be changed, unloaded, upgraded, removed, and could void the warranty, while the mp215 comes with ONE tune that is only removable by a FORD dealer, but gest registered with Ford and doesn't void the warranty. The reason it's locked is because it complies with California CARB law, a condition mandated for warranty compliance and Ford approval.