I'm definitely not an expert, but...
1) Assume E9X makes 414 HP at the flywheel
2) Assume proportionate drivetrain/dyno loss
Loss = 1 - (306/414) = 26%
F8X HP at the flywheel = 379/( 1 - Loss ) = 379/.74 = 513 HP
Obviously I'm making some assumptions and 513 BHP seems ludicrously high, but WOW!
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