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^ I think you are looking at this all wrong. You assume the engine is putting out 500 HP at 5500 RMPs. This is cannot be the case. All you can tell from the 550 HP/380 torque numbers that are quoted is where in the RPMs peak horsepower will be reached. In this case 7601 RMPs.
The relationship between torque and horsepower is not debatable. In fact there is no way to measure horsepower on a dyno. The dyno measures torque and RPM. Horsepower (as defined) is calculated using the following formula:
HP = (Torque * RPM)/5252
Sorry but these are the facts.
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