It all depends on tuning...My truck hit 623 hp and 1,387 tq on a mustang dyno with 90 hp ddp's. Since then, the head was oring'd stage 2 port n polish/valves, retainers, electric fans. ported exhaust manifold, bigger valves, disel pro cam, stud girdle, 12 V cryogenic treated rods, ditched the revo for the TNT, and threw flux 5.1's in there...You do the math, just the injector swap and revo back to tnt should have had me at 850 hp min. I don't know if they couldn't get the dyno to load or what. I do know that I need some real damn programming on this damn thing. All I hit on the dyno was 775 hp...BS