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Lol, proof is when the truck is hooked to the scan tool at the dealership, it has a flash counter, literally every manufacturer dies now. If the vehicle has not been in fir ecu updates or has not been updated the flash count will not match records and they can, and almost in every situation...

The factory tools COUNT FLASHES.. that's how they know if the computer has been tuned. If you turn it back to stock they can still detect the trucks been tuned because they keep all service records digitally and know if and or how mant tiles the dealerships have been in your ecu.