Throttle body size on a turbo/rotrex setup is less crucial than a roots-type blower. That's why you made 550whp on the stock Si tb. A roots blower sucks air in, and is limited greatly by tb size. However, rotrex blowers/turbochargers are forcefully pushing air into the motor, forcing more fuel as well. Tb size is still important, but greatly different than a roots blower type situation.
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