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Originally Posted by Stephen W.
To make what essentially computes to a 10% gain you’d have to decrease the number of friction points and greatly reduce the friction at all remaining points. Not to mention overcoming inertial loss, drag, windage, pumping and heat.
I say either, much more has been changed in the driveline than so far released
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Or perhaps revised intake and exhaust manifolds with a tune to match.
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or that 20 WHP figure is just pre sales hype
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I think 5 HP is what's on official sales documents. 15-20 WHP is coming from a reliable journalist/enthusiast (in this case Moto Miwa) who has a sterling record of accuracy.
Keep in mind manufacture reported HP numbers are sometimes understated due to national restrictions and tarrifs for import/export. Many Japanese coupes over the past few decades came in at 2.0L and 200-215 HP for this reason.