Watch the Hennessey Venom GT Spyder heat up the Dyno while promising to be faster than the Veyron. Recently, Bugatti announced that the Veyron Grand Sport Vitesse is the fastest open top production vehicle in the world. Hennessey is determined to prove the wrong with the Venom GT Spyder. They are currently planning a test run of their 1,200 hp Elise that could put Veyron on the second place.