EFI Live is a revolutionary new tuning tool for the Duramax and Cummins engine. The data logging features allow you to record and look at data in great detail. The tuning tool lets you program the fueling and other parameters any way you desire. This is all done using a computer to look at and change the maps and tables that are stored in our truck's ECM. With the latest release you can change between 5 different tunes on the fly, use a valet mode, staging mode, real time variable pulse width control, change transmission shift points, manually control gear selection and much much more.