Made entirely out of titanium.
We're not overly surprised to find "the most expensive exhaust system in the world" has been created for the most expensive car in the world. Developed as an aftermarket option for the Bugatti Veyron Grand Sport Vitesse, UK-based QuickSilver Exhausts claims its latest creation is made entirely from titanium but has yet to reveal how much they charged for it. Safe to assume then it was more than most people earn in a year.
Believed to be the first custom exhaust built for the Vitesse, the system has an absolutely brutal soundtrack and you can listen to it here as the Bugatti's 1,200-horsepower 8.0-liter quad-turbo W16 engine fires up.