Maximize horsepower & torque in your 4.6 4V with a 2003-04 Cobra tuner! By purchasing an SCT tuner for your 2003-04 Cobra, you can get the most out of your current modifications and adjust a variety of engine parameters. These tuners allow you to monitor your Mustang's PCM data live in real-time on screen to give you instant feedback on your motor's performance. This allows you to read and clear engine diagnostic codes to help with troubleshooting.