The FMF Factory 4.1 RCT Titanium Slip-On Exhaust is engineered for riders seeking refined exhaust performance, reduced sound levels, and application-specific tuning. Featuring FMF Resonance Chamber Technology, this exhaust uses a patented core shape to help lower sound output while maintaining maximum power. Its patented canister shape increases internal volume for additional sound-absorbing material, while the chamber design enhances and refines exhaust pressure for consistent performance.
Factory Forward Engineering centralizes the exhaust mass and helps reduce the likelihood of crash damage. The system includes a titanium canister and mid-pipe, plus a blue carbon fiber end cap for a distinctive, race-inspired finish. The innovative rear end cap allows straightforward installation of tuning tip inserts or a spark arrestor. A spark arrestor and wash plug are included for added versatility and maintenance convenience.
This FMF Factory 4.1 RCT exhaust is designed to fit select Yamaha off-road motorcycles, including the 2018 Yamaha YZ450F; 2019 Yamaha YZ450F, YZ450FX, and WR450F; 2020 Yamaha YZ450F, YZ450FX, and WR450F; and 2021 Yamaha YZ450F, YZ450FX, and WR450F. Manufacturer and vendor part number 044488. The exhaust measures approximately 36 inches long and weighs approximately 2.5 pounds.
Features:
- Resonance Chamber Technology helps reduce sound levels while maintaining strong power output
- Patented core shape enhances sound control and performance
- Patented canister shape provides increased internal volume for more sound-absorbing material
- Patented chamber design refines exhaust pressure for application-specific performance
- Factory Forward Engineering centralizes mass and helps reduce crash damage exposure
- Tuned exhaust with optimized core specifications for each motorcycle application
- Titanium canister and titanium mid-pipe construction
- Blue carbon fiber end cap provides a durable, distinctive finish
- Rear end cap supports simple installation of tuning tip inserts or a spark arrestor
- Includes spark arrestor and wash plug
- Fits 2018-2021 Yamaha YZ450F, 2019-2021 Yamaha YZ450FX, and 2019-2021 Yamaha WR450F models as specified
Fitment:
2018 Yamaha YZ450F
2019 Yamaha WR450F
2019 Yamaha YZ450F
2019 Yamaha YZ450FX
2020 Yamaha WR450F
2020 Yamaha YZ450F
2020 Yamaha YZ450FX
2021 Yamaha WR450F
2021 Yamaha YZ450F
2021 Yamaha YZ450FX
2022 Yamaha WR450F
2022 Yamaha YZ450F
2022 Yamaha YZ450FX
2023 Yamaha WR450F
2023 Yamaha YZ450F
2023 Yamaha YZ450FX
2024 Yamaha WR450F
2024 Yamaha YZ450F
2024 Yamaha YZ450FX
2025 Yamaha YZ450F
2025 Yamaha YZ450FX
2026 Yamaha YZ450F