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17 With everything finally assembled, we were finally ready to run Modern Mouse under boost. We started at the lowest boost setting (7-psi waste gate springs) and worked our way up to just under 13 psi. Even at 7.3 psi, Modern Mouse pumped out nearly 750 hp, but things got really interesting once we cranked it up. Running 12.8 psi, the turbocharged 383 produced 963 hp and 868 lb-ft of torque.