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If pushing the limits, the tuning is critical. The natural torque peak is where volumetric efficiency is highest, in the midrange. You limit boost in this range to limit torque. As the rpm increase past this point, you can increase boost, which will increase horsepower to the extent the turbos can keep up. I am not a tuner and don’t know these engine well, but typically factory turbos are sized for low to midrange response and the top end power potential is compromised. So you can’t just increase boost forever on the top end or you will push the turbos too far past their efficiency range, which means hotter boosted air and potentially turbo destruction.
Probably whatever Dinan at Carbahn or Utka Noa at Evolve or maybe Jordan at RK or one of a few other tuners says about safety is correct. They all seem to say about the same thing as far as torque.
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