"TEN YEARS OF THE BUGATTI VEYRON 16.4 GRAND SPORT VITESSE – THE WORLD’S FASTEST ROADSTER."
https://newsroom.bugatti.com/press-releases/ten-years-of-the-bugatti-veyron-164-grand-sport-vitesse-the-worlds-fastest-roadster
Quote>"1,200 PS in a roadster – with the introduction of the Veyron 16.4 Grand Sport Vitesse in 2012, Bugatti set new standards of power and performance from a roadster. A year later, the extraordinary hyper sports car cemented its unique status in the automotive world by hitting a top speed of 408.84 km/h – establishing itself as the world’s most powerful and fastest production roadster, a record for open-top vehicles that STILL STANDS TODAY."
I think that's incorrect actually, in fact I KNOW it is, but I'll check tomorrow. These records get complicated. Still incredible achievement nevertheless.