The Yangwang U9X reached a top speed of 503.17 km/h on a 7-kilometer straight stretch of the E11 highway in the Al Dhafra region of Abu Dhabi, becoming the first production supercar in history to surpass the 500 km/h mark. Behind the wheel was German driver Marc Basseng, who had previously taken part in Yangwang's earlier top-speed attempts. The run not only broke Yangwang's own record but also shattered the long-held ambition of the fuel-powered supercar industry to exceed 500 km/h—marques such as Bugatti and Koenigsegg had made multiple attempts without success, and the top-speed ceiling for combustion-engined cars remained at 490.5 km/h. Fuel-powered cars are hemmed in by the physical limits of substantial drivetrain losses and insufficient power at the wheels, making it difficult to cross that threshold. The Yangwang U9X, by contrast, is equipped with the Pro Max version of the Yi Si Fang four-motor architecture, delivering a combined peak output of over 3,000 horsepower, paired with a specially developed high-performance blade battery featuring a maximum discharge rate of 30C, and fitted with Giti bespoke semi-slick tires jointly developed to withstand such speeds. To avoid the problems posed by body roll on a high-speed oval track—which affects heat dissipation and tire grip—testing was moved to Abu Dhabi, where, in cooperation with local road authorities, the reflective road studs along the test section were removed and the holes filled in to ensure a smooth surface, ultimately achieving a breakthrough that fuel-powered supercars could not.