This all-new Special Edition Muffler provides the very highest levels of technology, performance, and of course, "cool". The custom carbon fiber end cap and blue anodized shell give this muffler a cutting-edge factory appearance along with state-of-the-art performance. It's the complete package! The Factory 4.1™ Muffler incorporates the latest FMF® Resonance Chamber Technology®. The patented chamber design enhances and refines exhaust pressure. It's patented core shape lowers sound level while maintaining maximum power output, and the patented canister shape increases internal volume for more sound-absorbing material. Factory Forward Engineering centralizes mass and is less prone to impact damage. Maintenance is made easy with the removal of four screws on the front end cap, and the innovative rear end cap simplifies installation of the spark arrestor (sold separately, 33D-E46C0-R0-00) or tuning tip inserts. Includes QuietCore™ 94 dBA insert. Meets AMA® and FIM sound requirements. Compatible with stock or FMF® header. Built 100% in the U.S.A.
YZ models are for closed-course use regardless of modification.