I calculated 371 RWHP / 0.83 = 447 crank HP (more)
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That's with a 17% drivetrain loss that usually is used for manual rear-wheel drive cars (either 15% - 17% loss).
21% drivetrain loss I think is too high, not sure though.
I'm going to dyno my car again pretty soon, should have a little bit higher number since I just added the headers and high flow cats. The ltw flywheel won't add any hp but it makes the car rev faster :)