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At a guess the extra comes from cams, head work different chargers.
Having gone down the rabbit hole it appears it actually forgoes the supercharger. Turbo power alone it is then!
Wonder if the power is just at the top end, or on the whole rev range.
"An original P1800 never wore tyres that big, of course. But it never had a chassis like this nor an engine that makes 414bhp at 7000rpm or 336lb ft at 6000rpm, nor revved to 7700rpm. “We want it to feel as naturally aspirated as possible,” Hans Bååth, Cyan’s general manager for cars, shouts over monsoon-levels winds in Peak District. “So when you get to 5000rpm and it feels fast, keep going.”"
Sounds very top end to me!
At a guess the extra comes from cams, head work different chargers.
Wonder if the power is just at the top end, or on the whole rev range.