The TTS MasterTune System includes three powerful Windows -based programs (MasterTune HD, DataMaster HD & VTune) designed specifically to tune Harley-Davidson Motorcycles. MasterTune-HD is an ECM reprogramming tool for H-D bikes that utilize the diagnostic interface. MasterTune-HD also supports 2005 and later Retrofit ECM Service Modules when installed on earlier vehicles. DataMaster-HD is a data collection tool specifically for use with 2001 and later Delphi-equipped H-D motorcycles that utilize the diagnostic interface. VTune is an easy-to-use VE table tuning tool tailored specifically for use with 2006 and later Delphi-equipped H-D's that are equipped with O2 sensors. . . With the MasterTune System, you can: Calibrate factory speedometers; Correct cruise control and 6th gear light (Primary Ratio Correction) issues; Trims spark tables automatically while correcting the fuel system; Analyze the engine's actual volumetric efficiency; Reduce tuning time for a smoother running, more responsive engine. Check and clear diagnostic codes. Save and restore the current calibration in the ECM (factory or other). Install custom calibrations from other sources. Compare functions quickly in tables. Choose from a wide selection of base mapsGraph in 2D, 3D or line options.. Display all vehicle data as well as various calculated channels. View real-time engine parameters. Record data without a computer. Record as much as 8 hours of data. Store up to 64 recordings. Automatically start/stop recordings. The TTS MasterTune software is compatible with both 32- and 64-bit versions of Windows XP and Windows 7. Cables sold separately. Made in USA. Single Program (1 Bike)