Fits The Following Bikes: Yamaha TT-R50 2006-2013 Exhaust Description: The Ti-4 System is designed to increase performance from bottom to top end, making it easier to ride faster. The Ti-4 is also constructed from titanium, which means a lighter system compared to stock. Please contact Pro Circuit for information on replacement parts. Features Include: Designed as a "full race" exhaust system Includes a USFS-approved spark arrestor Bottom to top end power increase CNC machined exhaust flange on head pipe for perfect fit 2 piece system that includes muffler, and head pipe Strong mounting bracket on canister