Currently, the world’s fastest street car is the Koenigsegg Agera RS, which reached 447.19 km / h in 2017. Incidentally, the car has a 5,000 cc twin-turbocharged 1341-horsepower engine. Previously, the record was held until 2010 by the Bugatti Veyron at 431,072 km / h. In this table you will find the previous recorders as well as the current one:
https://en.wikipedia.org/wiki/Production_car_speed_record