purchased a couple months ago for my 2013 f150, upgraded to a live wire and used the x4 on my mustang. I am going in for a dyno tune and will no longer need this.  Unmarried from my car and ready to go ! Price is $400 and firm.  Thanks for looking 

FEATURES

SF4/X4 is the Newest Replacement for the Popular SF3/X3

Pre-Configured SCT Tunes

Improves Horsepower, Torque, Overall Performance, and More

On Screen Data Logging and Monitoring

Reads/Clears DTC Trouble Codes

Full Color LCD Display with Auto Dim Feature

Built-In WiFi for Easy Updates

PC/Windows Compatible Only

Works on all 1996-2017 Mustangs

DESCRIPTION

Increased HP and Torque. From the factory, the manufacturer programs their vehicles to cater to the needs of the daily driver, not the performance enthusiast. After loading a SCT pre-configured strategy tune on a vehicle, even a bone stock, unmodified Mustang will realize noticeable gains in Horsepower, Torque, and Fuel Economy.