Ironically the one successful turbocharged Prius didn't even get more power, it did however solve the turtle mode from ever appearing since the engine now produces enough excess power to keep the batteries charged. The power that goes to the wheels is tightly controlled by the ECU and the motors, and without completely replacing the code and motors, you can't really go any faster.
Modern prius engines have enough power to keep the batteries topped off 99% of the time so the turbo isn't really needed for this usecase anymore.
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