Honda CRF 250 R 2011-2013, Part No. 06-095.FMF.F4A FMF 041481 - Item fits 2011-2012 models. - Incorporating Resonance Chamber Technology.- Patented core shape lowers sound level while maintaining maximum power output.- Patented canister shape increases internal volume for more sound absorbing material. - Patented chamber design to enhance and refine exhaust pressure. - Factory Forward Engineering centralizes mass and is less prone to crash damage. - Tuned exhaust with optimized core specifications for each application. - Comes with the quality, craftsmanship and performance expected from FMF. Meets AMA and FIM sound requirements. QuietCore 94db insert included. Spark arrestor included in muffler. Built 100% in the U.S.A. at FMFs state-of-the-art-factory. Maintenance made easy with the removal of 4 screws on the front end cap. Notice: For Closed Course Competition Use Only. Not Intended for Street Use. �