Bentley Continental Flying Spur Speed, unveiled by Bentley Motors in 2009, is the world's fastest four-door sedan with a top speed of 322 k/h and an acceleration time from 0 to 100 k/h for 4.8 s. It is equipped with 6.0 litre twin-turbocharged W12 engine with DIN rated power output of 600 hp at 6,000 rpm and torque of 553 lb-ft at 1,700-5,600 rpm. It features 6-speed automatic transmission, which routes the power to all four wheels, an electronic power steering, enlarged disc brakes and an upgraded Bosch ESP 8.1 system with 'Dynamic' mode.