The FMF Aluminum Factory 4.1 RCT slip-on exhaust is engineered for select KTM and Husqvarna off-road motorcycles. Featuring FMF Resonance Chamber Technology, this exhaust uses a patented core shape to reduce sound output while maintaining strong power performance. Its patented canister shape provides additional internal volume for sound-absorbing material, while the chamber design refines exhaust pressure for optimized response.
Factory Forward Engineering centralizes the exhaust mass and helps reduce the likelihood of crash damage. The exhaust is tuned with application-specific core specifications to provide a precise fit and performance-focused replacement for the original equipment muffler. The innovative rear end cap allows straightforward installation of tuning tip inserts or a spark arrestor, and the included spark arrestor supports trail and off-road use where required.
This FMF Factory 4.1 RCT model features an aluminum canister and stainless steel mid-pipe. A wash plug is included to help protect the exhaust system during cleaning and maintenance. Manufacturer part number 045647 and vendor part number 045647 identify this FMF exhaust assembly. It fits 2020-2021 KTM 350 XCF-W and KTM 500 XCF-W motorcycles, as well as 2020-2021 Husqvarna FE 250, FE 350, and FE 501 models. Verify the motorcycle year and model before installation.
Features:
- Resonance Chamber Technology: Uses advanced chamber engineering to balance sound control with strong power output.
- Patented Core Shape: Lowers exhaust sound while helping maintain maximum performance.
- Patented Canister Shape: Increases internal volume for additional sound-absorbing material.
- Patented Chamber Design: Enhances and refines exhaust pressure for application-specific performance.
- Factory Forward Engineering: Centralizes mass and helps reduce vulnerability to crash damage.
- Application-Tuned Core: Optimized core specifications provide a precise fit and tuned exhaust performance.
- Innovative Rear End Cap: Simplifies installation of tuning tip inserts or a spark arrestor.
- Aluminum Construction: Includes an aluminum canister with a stainless steel mid-pipe.
- Included Accessories: Comes with a spark arrestor and wash plug.
- Fitment: Fits 2020-2021 KTM 350 XCF-W and 500 XCF-W, plus 2020-2021 Husqvarna FE 250, FE 350, and FE 501 motorcycles.
Fitment:
2020 Husqvarna FE 250
2020 Husqvarna FE 350
2020 Husqvarna FE 450
2020 Husqvarna FE 501
2020 KTM 350 XCF-W
2020 KTM 500 XCF-W
2021 Gas-Gas EC 250F
2021 Gas-Gas EC 350F
2021 Husqvarna FE 250
2021 Husqvarna FE 350
2021 Husqvarna FE 450
2021 Husqvarna FE 501
2021 KTM 350 XCF-W
2021 KTM 500 XCF-W
2022 Gas-Gas EC 350F
2022 Husqvarna FE 250
2022 Husqvarna FE 350
2022 Husqvarna FE 450
2022 Husqvarna FE 501
2022 KTM 350 XCF-W
2022 KTM 500 XCF-W
2023 Gas-Gas EC 350F
2023 Husqvarna FE 250
2023 Husqvarna FE 350
2023 Husqvarna FE 450
2023 Husqvarna FE 501
2023 KTM 350 XCF-W
2023 KTM 450 XCF-W
2023 KTM 500 XCF-W