we built it. we bought the hesco performance kit. than i got ford 5.0 injectors. banks header. throttle body and spacer. It works really well i think. I need an intake cause im still running the stock one. but running premium, i get about 15 mpg in the city with 35 and 4.88.. but when im on the trail it really performs well. i can tell the difference between my rig and my friends rig.