I know 3 guys that run EFILive around central ohio and it is an amazing thing and it is so cheap to operate. But you really have to know what your doing to build a good tune. Lots of test and tune but it is amazing what that system can offer. You can literally change any parameter in fuel, timing and so much else with a click of the mouse. You can also data log everything that is happening to the truck as you make a run, like rail psi, timing, rpms, the size of the fuel shot. One of them dynoed his truck at 544 horse and the only thing else he has is a fass fuel system and an air filter with a built transmission.