The truck has a rail plug in it, the bag of parts is rated to flow between 15-19% over stock, my 100hp injectors are 30% over stock, withe the programming turned up it can still out run the fuel supply. With a pressure box it held at 27,000 psi, I dont know what the dyno numbers would of been with the pressure box, as I didn't run it, I ran the truck as it was set up daily on the street.