The Jet E-Z Tune Programmer is the economy version of the full Performance Programmer and is designed for the driver who only wants to change engine tuning and does not want to change transmission shifting, shift points or speed/rev limiters. No custom programming is available. The E-Z Tune Programmer contains the same Tri-Power Tuning found in the full version which lets you program for either regular, midgrade or premium fuel. Jet's Tri-Power Tuning gives you premium performance with lower cost regular octane fuel or program for even more performance using midgrade or premium fuel. E-Z Tune also contains a scan tool to read/clear diagnostic trouble codes and is upgradeable to the full Performance Programmer version.