Well for starters, what kind of supporting mods do you have on the motor to run that kind of boost? To run those kind of power levels, you really need a stand alone fuel management system, not a tuner. The truck will also be unusable on the street.
If you have done all the supporting modifications, you can deliver enough fuel, and the turbo is large enough, you should be hitting mid 600s. Problem is you can hit those kind of power levels with a single throttle body.