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Assuming a 15-17% drivetrain loss on a RWD car is pretty optimistic. For the xDrive (AWD), that would make more sense to me. Around 10% seems more likely in this case.
Also, Dyno Jets are only optimistic... so I'm not sure how much faith I'd put in the OP's conclusion that the car is underrated from the factory.
However, DJ or not, 226WHP/230WTQ with that torque curve from the factory bodes very well for the future potential of this engine.
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