It's not your turbo and it's not the engine......
The problem is the OEM torque management program. It kills your low end response.
The stock tuning has a HUGE delay programmed into it. From a dead pedal, there is almost a 20 second delay until you actually have full rated power. This is due to the derate to protect the driveline (torque management) and it SUCKS!
While something like the Edge does help, the only way to really get rid of the torque management program is a true tuner.
Something like a Smarty that has the ability to turn the TQM down or eliminate it completely is the way to do it.
You be surprised how powerful the truck is, with only a 30HP tune but with all the TQM turned off. It feels like a rocket.
I let my buddy use my Smarty on the lowest tune possible (30 HP) but I turned off the TQM and he was lighting the tires as he left the driveway.
It really is nice and day when the engine actually produces the power that it has when you want it.