John,

I pull a 15K 5er, and I would say it's a little slow getting up to 60, but once there it will hold that speed below 1300 EGT up some pretty steep grades without much trouble. Pulling only 9K I'm guessing it would feel like a stallion. I use an Edge Evo II and the on-board pressure sensor has never shown over 15 lbs, usually 14 max WOT and pulling a grade. 5 lbs is bad. Got to be something wrong with the turbo or sensors. The 7.3 is a real strong motor.