Is it possible they detuned the 850 motor with lower compression then brought back the power to the stock 165HP level?
Might still be running boost at lower elevations?
Just thinking out loud
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There has to be a slight detune built into the bypass exhaust and intake setup at least at high rpm. (Assuming everything was optimized before and now is complicated N/A)
Low boost would easily cure that once up to operating rpm.