Fits 2015-2017 Mustang GT Features exclusive no-lift shift strategy and enhanced throttle response Ford Performance calibrations feature exclusive Ford proprietary software and engineering Ford Performance calibrations are 50 state legal with CARB EO (D-598-19) Calibrations available for manual and automatic transmission Allows gear ratio changes up to 4.09:1 Automatic calibrations feature optimized performance shift schedule Premium fuel, 91 octane or higher, is required Calibrations are available with three levels of hardware and performance M-9603-M8 - Power Pack 1 Includes high flow K&N air filter 13hp and 16lbs/ft peak gains over stock 40lbs/ft gain at 1500rpm M-9603-M8A - Power Pack 2 (shipping by 10-31-16) Includes GT350 cold air intake with 87mm throttle body and exclusive intake adapter (hardware available separately without calibration as part number M-9603-M50) 21hp and 24lbs/ft peak gains over stock 40lbs/ft gain at 1500rpm Industry exclusive open air filter with CARB EO M-9452-M8 - Power Pack 3 (shipping by 10-31-16) Includes GT350 cold air intake with 87mm throttle body and GT350 intake manifold M-9424-M52 37hp and 5lbs/ft peak gains over stock 60hp gain at 7500rpm Industry's only 50-state legal calibration with performance intake manifold Calibration Notes: Ford Performance ProCal tool, included with all calibrations, requires laptop and internet access for calibration install At this time Power Packs are sold separately and cannot be upgraded without the purchase of an entire kit. Powertrain calibrations are developed and supported for U.S. and Canadian vehicles Federal and state laws prohibit any person from installing aftermarket add-on or modified parts prior to the sale of a new motor vehicle