Includes 4 credits. For some models additional credits may be required for TCM, FICM, FSCM, and CCM tuning (sold separately). Please be aware that this is a powerful programming tool. It will unlock the onboard ECU on the vehicle being tuned to the point where an inexperienced tuner may inflict engine damage accidentally. There are no built-in safeties. Please see applications tab for vehicle credits and specific notes that may pertain to your vehicle.