Ti-6 BC Titanium System. Pro Circuit's Ti-6 BC 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 BC Titanium Exhaust System is constructed of titanium throughout the head pipe, mid pipe, and canister. The Ti-6 BC is the next generation of professional level race exhausts. The Ti-6 BC is a full race system intended for closed-course racing only. Passes AMA / FIM sound regulations. Improves performance. Titanium construction throughout head pipe, mid pipe, and canister. Titanium end-cap construction. 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. TIG precision welding.