Texas Hennessy performance car company celebrated its 25th anniversary in style at this Fans also became afraid. Hennessy Knhwartebl the world’s fastest speed (open top) car designed. The company chose the Venom GT Spyder. GT Spyder speed of 427.4 kilometers per hour during a test ran on. This car is the Bugatti Veyron Super Sport broke the records for vitesse. Bugatti Veyron Super Sport was vitesse speed record of 408.8 kilometers per hour.