With its 308.4mph recorded speed the Yangwang U9 Extreme (or U9X for short) went 3.6mph faster than the Bugatti Chiron Super Sport 300+, BYD confirming a limited production run of “no more” than 30 customer cars off the back of the achievement. No cost has yet been confirmed but expect the queue to build nearly as quickly as the number of secondhand Bugatti Chirons being listed on Autotrader!Inevitably, that top speed isn’t the only big number when it comes to the U9X, which is itself based on the existing U9 already on sale in China where it’s sold under the Yangwang name. Like the Denza luxury sub-brand we’ve already had a taste of , this is part of the larger BYD operation and engineering signatures like its ‘Blade’ battery tech (versions of which is found regular models like the BYD Dolphin ) have helped power the U9X to this record breaking speed. That and four electric motors putting out a combined total of more than 3,000 horsepower.