I know a little about these 3rd gen trucks, but I am a 2nd gen guy myself, so when a guy with a common rail told me he was making 780/1800, I had a hard time believing it. I ask what all he had and he said you name it, I got it. Propane, nitrous, a couple different boxes, a turbo etc. The truck would spin the duals in every gear and he was disappointed because his "unslippable" Centerforce clutch wouldnt hold. I don't doubt 500-600 horses, but just how reasonable is 780 with the common rails? Asked him about boost and he said 55 lbs. , no rings.