Well for most car guys you already know what the Bugatti Veryon is. If you don't know what it is you basically live under a rock. It is a 16.4 liter quad(4) turbo W16 engine. Every Bugatti Veryon had a a quad turbo W16 engine but the Grand Sport Vitesse is a more powerful engine that had at one point held the title for the fastest production car in the world. "Vitesse" is the french word for "speed" and the top speed on the Grand Sport Vitesse is about 409 KM/H (255.6MP/H)