BYD's Yangwang U9 Xtreme with 2,977 bhp has just cracked the 500 km/h top speed mark for production vehicles as it just achieved 503.17 km/h. BYD Yangwang U9 Xtreme Speed Record You might remember BYD Yangwang U9 which debuted a couple of years ago as the vehicle that featured DiSus-X intelligent body control system that could perform rhythmic body movements (basically dance) and then it also stole the limelight by jumping in.