Hello all, I have a '99 cl with e7 etech 460. I seem to be plagued with low power, I have owned the truck for two years and it has never performed the way it should. I will start with what I know; no intake leaks, boost at 25-27lbs, no miss or rough running, not much black smoke, no fault codes. Now for the kicker, dyno test at 370hp, which is 80% of rated hp. I am told the 20% loss from flywheel to ground is acceptable. This truck is set up for heavy haul, 20k front and 46k rears, double frame, 18 speed, LOW rear end gears. I should have all the power I need to haul 80-85k loads and yet I'm passed by every truck on the road. Do I have a torque issue? Ecu issue? Is the turbo not spooling up fast enough to make the torque I need when I need it? Do I have fuel unit pump problems? I'm stumped! And just about fed up! The mack dealer told me it's just my perception and that the truck is fine. I need help please!