My friend Rick from Elk Grove CA Dyno'd his 05' 4-door,dually 4x4 yesterday at the Oroville dyno day put down 511hp/902tq with just a Powermax CR box,and B-D twins. . i thought that was amazing considering there's no pusher or FASS system on the truck either, yeah and stock clutch :--) . Ramafier,and Bullydog's are on the way. . maybe some F-1 injectors and Nitrous... Look out Piers :-laf