The McLaren is running around 650PS for that sort of acceleration up to 300kph. What is interesting is that the McLaren has that thermal reserve in its engine, the Porsche (if ECU tuned) could probably manage 650PS up to 250kph but those last ~10s of mega load are very punishing and sorts the men out from the boys.....


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997 GT2 2014 3.9 Mezger, 800PS @ 1.2 bar