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I'd question the interpretation of those power figures. It seems to be a very suspicious coincidence that the European S63T generates 552 hp (ECE) 560 PS, 412kW (which is exactly what BMW quote) and the USA S63T generates 560 hp (SAE net), 568 PS, 417.5kW, which I've never seen quoted by BMW.
As far as I can see BMW USA only quote 560 hp in US literature, with no qualification, and no kW equivalent, so it's ambiguous.
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