I've been following the McMurtry Spéirling for a few years.
Now that's a car. Thing can literally drive upside-down, such is the downforce.
I'm tippin' it's not as fast in a straight line as the Koenigsegg but nothing can touch it cornering. Smashed the Goodwood Festival of Speed all-comers record last year. 0-233 km/h (145 mph) in 4.98 seconds and under 8 sec for the 1/4 mile. Definitely not-shabby, but its real strength is in the cornering. It'll wallop an F1 car 'round the track I reckon, probably by some margin. Dunno.