Here is the dyno results, at the rear wheels.
Assuming 20% drivetrain losses (auto trans and 4x4), we made 284HP at the crank.
AF was too rich above 4500rpm so there could be a bit more power there if we
lean it out a bit. I would prefer to see it no richer than 11.5:1.
Since that initial run, the truck was custom tuned by Brian
7-2008 update: We installed a smaller supercharger pulley and Snow Performance water injection. It now make about 8psi boost.