The FMF Factory 4.1 RCT Slip-On Exhaust is a tuned performance exhaust designed for select KTM and Husqvarna motocross and off-road motorcycles. Manufacturer part number 045586 and vendor part number 045586 identify this application-specific system, which uses FMF’s latest Resonance Chamber Technology to reduce exhaust sound while preserving strong power output. The patented core shape and chamber design help refine exhaust pressure for responsive, consistent engine performance.
Factory Forward Engineering centralizes mass and helps reduce the likelihood of crash damage, while the patented canister shape provides additional internal volume for sound-absorbing material. Each application receives optimized core specifications for its engine and chassis. This version features a lightweight aluminum canister, stainless steel mid-pipe, and a carbon fiber end cap for a durable, performance-focused construction.
Installation and maintenance are simplified with an innovative rear end cap that accepts tuning tip inserts or a spark arrestor. A spark arrestor and wash plug are included, making the exhaust suitable for trail and off-road use where spark-arresting equipment is required. The FMF Factory 4.1 RCT Slip-On fits the 2015 KTM 250 SX-F Factory Edition, 2015 KTM 450 SX-F Factory Edition, 2016-2017 KTM 350 SX-F, 2016 KTM 350 XC-F, 2017 KTM 350 XC-F, 2017 KTM 350 EXC-F, 2016-2017 Husqvarna FC 250, and 2016 Husqvarna FC 350. Verify the motorcycle model and year before ordering.
Features:
- Resonance Chamber Technology: Uses FMF’s latest chamber technology to help lower sound levels while maintaining maximum power output.
- Patented Core Shape: Refines exhaust flow and pressure for strong, responsive engine performance.
- Patented Canister Shape: Increases internal volume for additional sound-absorbing material.
- Factory Forward Engineering: Centralizes exhaust mass and helps reduce exposure to crash damage.
- Application-Specific Tuning: Uses optimized core specifications for each compatible motorcycle.
- Aluminum Construction: Includes an aluminum canister and stainless steel mid-pipe for durable performance.
- Carbon End Cap: Provides a lightweight, durable rear-end finish.
- Easy Tuning Access: Rear end cap accepts tuning tip inserts or a spark arrestor.
- Included Components: Spark arrestor and wash plug are included.
- Fitment: Fits select 2015-2017 KTM 250 SX-F Factory Edition, 350 SX-F, 350 XC-F, 350 EXC-F, 450 SX-F Factory Edition, Husqvarna FC 250, and Husqvarna FC 350 models.
Fitment:
2015 KTM 250 SX-F
2015 KTM 250 SX-F Factory Edition
2015 KTM 350 SX-F
2015 KTM 450 SX-F
2015 KTM 450 SX-F Factory Edition
2016 Husqvarna FC 250
2016 Husqvarna FC 350
2016 Husqvarna FC 450
2016 KTM 250 SX-F
2016 KTM 250 XC-F
2016 KTM 350 SX-F
2016 KTM 350 XC-F
2016 KTM 450 SX-F
2016 KTM 450 XC-F
2017 Husqvarna FC 250
2017 Husqvarna FC 350
2017 Husqvarna FC 450
2017 Husqvarna FE 250
2017 Husqvarna FE 350
2017 Husqvarna FE 450
2017 Husqvarna FE 501
2017 Husqvarna FX 350
2017 Husqvarna FX 450
2017 KTM 250 EXC-F
2017 KTM 250 SX-F
2017 KTM 250 XC-F
2017 KTM 350 EXC-F
2017 KTM 350 SX-F
2017 KTM 350 XC-F
2017 KTM 450 EXC-F
2017 KTM 450 SX-F
2017 KTM 450 XC-F
2017 KTM 500 EXC-F
2018 Husqvarna FC 250
2018 Husqvarna FC 350
2018 Husqvarna FC 450
2018 Husqvarna FE 250
2018 Husqvarna FE 350
2018 Husqvarna FE 450
2018 Husqvarna FE 501
2018 Husqvarna FX 350
2018 Husqvarna FX 450
2018 KTM 250 EXC-F
2018 KTM 250 SX-F
2018 KTM 250 XC-F
2018 KTM 350 EXC-F
2018 KTM 350 SX-F
2018 KTM 350 XC-F
2018 KTM 450 EXC-F
2018 KTM 450 SX-F
2018 KTM 450 XC-F
2018 KTM 500 EXC-F
2019 Husqvarna FE 250
2019 Husqvarna FE 350
2019 Husqvarna FE 450
2019 Husqvarna FE 501
2019 KTM 250 EXC-F
2019 KTM 350 EXC-F
2019 KTM 450 EXC-F
2019 KTM 500 EXC-F