Ford Performance 2011-2014 Mustang GT Performance Calibration with High Flow K&N Air Filter

Whether it's corner-carving performance or straight-line acceleration you crave, you'll find a performance package that's exactly right for your Mustang with one of Ford Performance's Performance air filter and calibration kits. Each of the Ford Mustang kits packs include a K&N filter and ProCal tool with the performance calibration to help unlock your pony car's true potential, generating optimal horsepower and torque, while delivering engine durability and drivability. Plus, these upgrade kits are 50-state emissions legal!