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The Predator is not an add on fuel box like Banks or Edge, it reflashes your ECM. When you want to return your truck to stock programming the Predator has stored your original tune and can return it to the ECM.
If you still have questions read through the posts here.....plenty of arguments between the fuel boxes which intercept and modify a signal, or a true code reader and flash programmer like Predator and SCMT....Super Chips Micro Tuner