Here is what Hypertech found for a stock 2004 6.0 on their dyno.
@ 2000 rpm: 166 hp and 436 fpt.
@ 2500 rpm: 217 hp and 464 fpt.
Max hp = 296 @ 3350 rpm
Max Tq = 473 @ 2250 rpm
Hypertech stage 3
@ 2000 rpm: 219 hp and 575 fpt.
@ 2000 rpm: 166 hp and 436 fpt.
@ 2500 rpm: 217 hp and 464 fpt.
Max hp = 296 @ 3350 rpm
Max Tq = 473 @ 2250 rpm
Hypertech stage 3
@ 2000 rpm: 219 hp and 575 fpt.