Pro Circuit's Ti-6 Pro Titanium Exhaust System was created for professional racers competing in a series such as AMA Supercross or AMA Motocross to ensure they pass AMA / FIM sound regulations. The Ti-6 Pro Titanium Exhaust System is constructed of titanium throughout the head pipe, mid pipe, and canister while the end-cap is constructed of carbon fiber. Riders will notice an increase in performance over the previous Ti-5 system. Passes AMA / FIM sound regulations. Improves performance. Titanium construction throughout head pipe, mid pipe, and canister. Carbon fiber end-cap construction. Equipped with RC-4 Resonance Chamber to reduce noise output (most models). Machined aluminum muffler bracket for increased strength and durability. Asymmetrical muffler configuration for increased packing volume. Machined mid pipe to head pipe joint for a better, leak free fit.