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There are plenty of hondas out there with the GT28RS with 380whp or more at around 28psi. They're 1.9L or so and we have a 2.0L with a better flowing head.
380whp is around 440 at the crank. that's not even on the chart for the compressor map of the GT28RS, much less in its efficiency range. you have any of these dyno charts?