That is a good dyno run for your car. If you figure a 25% drivetrain loss, you have 242.13 horsepower to the crank. I bet you car rips along quite well. The last time I dynoed my supercharged SEC, I recorded 314 RWHP and 361.4 RWTQ. Assuming a 25% loss in my drivetrain, I have 418 crank horsepower.