This ProCharger System is supplied with proven tuning calibrations and a handheld programmer set for a 55-60%+ HP (@ 8 psi) power gain over stock, running pump gas for Stock engine - Stock exhaust or Cat-back exhaust vehicles only. Featuring the most advanced and durable supercharger, with the industry's coolest charge air temperatures, much higher power levels are possible with higher boost and custom tuning. Installation of this system is the easiest of any Mustang supercharger system to date-a customer can install this system in his/her garage with common hand tools in a day. 100% reversible, with no trimming or cutting to any factory OEM plastics or hardware.