Vance & Hines unveils the newest must-have innovation for the revolutionary new Yamaha YZ450F. Already touted as the best in class, Vance & Hines has just made the new 450 even better! Extensive dyno testing and real world track testing has led to a new realm of V&H performance. Introducing the first and only Dual Chamber exhaust system! The new Ti-Pro dual chamber system increases horsepower throughout the power band while maintaining ridability. The Ti-Pro is the ultimate addition for race inspired performance.