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 USA at FMFs state-of-the-art-factory Maintenance made easy with the removal of 4 screws on the front end cap