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Comparing American numbers to European/Australian/SA numbers is pointless. The latter tend to make the same crank figures as claimed by the manufacturer. Where as in America the manufacturer claimed figure is closer to your wheel numbers. For example most ps2 results tend to fall between 520-550 flywheel horsepower over here where as in the states it's 520-550 whp.
Terminal/trap speeds and vbox numbers are a better way to compare but even then you have different climates and environments that people will still argue over.
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