Lei Jun announced on Weibo and Xiaohongshu: The Xiaomi SU7 Ultra prototype made its debut at the Nürburgring Nordschleife (Nürburgring) with an astonishing official lap time of 6 minutes 46.874 seconds, winning the title and becoming the world's fastest four-door car. The Nürburgring Nordschleife is located in the Nürburg town in Cologne, Germany, with a total length of 20.832km, known as the "automotive performance touchstone". The Nürburgring Nordschleife is a track that truly tests the comprehensive capabilities of vehicles and is recognized worldwide as the most challenging track, once known as the holy grail of racing