Upgrade your Yamaha YZ450F with the FMF Factory 4.1 RCT Slip-On Exhaust, designed with advanced resonance chamber technology for optimal performance. This exhaust system features a patented core shape that reduces sound levels without compromising power output, providing a quieter ride with enhanced engine efficiency. The innovative canister shape increases internal volume, allowing for more sound-absorbing material that contributes to a refined exhaust note and improved sound quality. Crafted with a patented chamber design, this exhaust helps to enhance and refine exhaust pressure, promoting better flow and engine responsiveness. Factory forward engineering centralizes mass for durability and minimizes the risk of crash damage, making it ideal for aggressive riding conditions. The tuned exhaust with optimized core specifications ensures compatibility and peak performance tailored to each application. Additionally, the rear endcap is designed for easy installation of tuning tip inserts or spark arrestors, providing versatile customization options. A titanium midpipe offers extreme weight savings, reducing overall bike weight and improving handling. This high-performance exhaust system is built for riders seeking durability, refined sound, and maximum power in a lightweight package, suitable for competitive racing or serious trail riding. Features: * Incorporates the latest resonance chamber technology for optimal performance * Patented core shape lowers sound levels 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 for durability and crash resistance * Tuned exhaust with optimized core specifications for each application * Innovative rear endcap for easy installation of tuning tip inserts or spark arrestors * Titanium midpipe for extreme lightweight performance