Upgrade the exhaust performance and sound control of your Kawasaki motocross or cross-country motorcycle with the FMF Factory 4.1 RCT Aluminum Slip-On Exhaust. Designed for select 2019–2023 Kawasaki KX450F models and 2021–2023 Kawasaki KX450X models, this tuned exhaust uses FMF Resonance Chamber Technology to refine exhaust pressure while helping maintain strong power output. The aluminum canister is paired with a stainless steel mid-pipe for a durable, application-specific design.
Patented construction helps reduce sound levels without sacrificing performance. The patented core shape and expanded canister provide additional space for sound-absorbing material, while the chamber design improves exhaust flow and pressure characteristics. FMF Factory Forward Engineering centralizes the exhaust mass and helps reduce exposure to crash damage, making this slip-on a practical choice for demanding track and trail use.
Installation is straightforward with the included end cap, spark arrestor, and wash plug. The innovative rear end cap also supports simple installation of tuning tip inserts or a spark arrestor when configuration changes are needed. This product is manufactured by FMF and identified by manufacturer and vendor part number 042369. Verify the motorcycle model and year before ordering to ensure proper fitment.
Fitment: 2019–2023 Kawasaki KX450F; 2021–2023 Kawasaki KX450X.
Features:
- Resonance Chamber Technology: Incorporates FMF's latest chamber technology for refined exhaust performance.
- Patented Core Shape: Helps lower sound levels while maintaining maximum power output.
- Expanded Canister: Increases internal volume for additional sound-absorbing material.
- Patented Chamber Design: Enhances and refines exhaust pressure for application-specific tuning.
- Factory Forward Engineering: Centralizes mass and helps reduce vulnerability to crash damage.
- Application-Specific Tuning: Uses optimized core specifications for the Kawasaki KX450F and KX450X.
- Aluminum Construction: Includes an aluminum canister with a stainless steel mid-pipe.
- Rear End Cap: Allows simple installation of tuning tip inserts or a spark arrestor.
- Included Components: Spark arrestor and wash plug are included.
- Fitment: Fits 2019–2023 Kawasaki KX450F and 2021–2023 Kawasaki KX450X models.
- Brand and Part Number: FMF Factory 4.1 RCT, manufacturer and vendor part number 042369.
Fitment:
2019 Kawasaki KX450F
2020 Kawasaki KX450F
2021 Kawasaki KX450F
2021 Kawasaki KX450X
2022 Kawasaki KX450F
2022 Kawasaki KX450X
2023 Kawasaki KX450F
2023 Kawasaki KX450X