damn, tuner only? Great numbers! What setting was the SCT on or custom tune? I am going to be putting my 6.0 on the dyno soon to get some pre-tuner numbers.
Good numbers! We usually hit 410-44x rwhp on our DynoJet 224xlc with our Xtreme tune on 6.0L trucks. Believe it or not, it varies that much from year to year/truck to truck.
Any corrections? Guy I work with has intake, exhaust chip and a fuel spring in his and he only got 370, but it was on a mustang dyno with no corrections or anything, so it was actual horsepower