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Guys, high-revving engines and turbos aren't anything new, or hard to do. You size a turbo using its compressor map and plotting an engine using displacement, volumetric efficiency, and your desired RPM range.
If you had more RPM you could keep the same turbo and choke it, or get a larger turbo to make more torque in that extra RPM range, while sacrificing torque in the lower RPM range.
This is a very basic answer but I'm at work and don't have time to go into detail.
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