This is an exclusive one-off (well, they've actually built 80 of them. All sold) of an already very exclusive hypercar. It's the Koenigsegg Regera Naked Carbon. This Regera (which is Swedish for "to reign") is a 250mph monster, its 5-litre twin-turbo V8 is capable of 1,479 bhp and 1,475 torques.
This is a serious machine. It's 20 kg lighter than the "standard" Regera (I'm not sure the word 'standard' ever applies to supercars with a price tag in excess of a million dollars, but still...). It accelerates from 0 to 248 mph (yes) in under 20 seconds and I'll just leave it at that.