The ATS E-Power Electronic Tuner is the most comprehensive option for your GM Duramax® diesel truck. This programmer includes three tuning files capable of adding 50-270 horsepower. Eliminates issues associated with "plus-in" power modules, because the tuner uses the factory, solid state readable PCM. Monitor and log all critical parameters. Read and clear data trouble codes output using the OEM computer. Versatile and easy to use. Includes custom designed ATS programs.