Quick view ID Speed Shop ID Speed Shop 2020-21 Mustang GT500 Custom Tune Compare $595.00 93 Octane 45+ Horsepower 45+ ft-lbs Torque No Throttle delay Reduced Torque Management Raised shift points 91 Octane 35+ Horsepower 35+ ft-lbs Torque Decreased Throttle Delay Smooth Power band Your choice of a single custom tune. We will... Choose Options Choose Options