The FMF Factory 4.1 RCT Slip-On Exhaust Muffler is engineered for select Honda CRF450X models from 2005–2009 and 2012–2016. Featuring FMF Resonance Chamber Technology, this exhaust system is designed to reduce sound levels while maintaining strong power output. Its application-specific tuned core helps optimize exhaust flow and refine pressure for responsive performance across a broad range of riding conditions.
The patented canister design increases internal volume for additional sound-absorbing material, while the chamber configuration helps enhance exhaust performance. FMF Factory Forward Engineering centralizes mass and positions the muffler to help reduce exposure to crash damage. This version uses an aluminum canister with a stainless steel mid-pipe, combining lightweight construction with durable materials suited to off-road use.
Installation is simplified by the innovative rear end cap, which accepts tuning tip inserts or a spark arrestor. The FMF Factory 4.1 RCT includes a spark arrestor and wash plug for convenient trail preparation and maintenance. It is designed as a slip-on replacement for compatible original equipment exhaust components and fits 2005, 2006, 2007, 2008, and 2009 Honda CRF450X models, as well as 2012, 2013, 2014, 2015, and 2016 Honda CRF450X models. Manufacturer and vendor part number: FMF 041517.
Features:
- Resonance Chamber Technology: Uses an updated chamber system to help lower sound output while preserving power performance.
- Patented Core Shape: Helps control exhaust sound without sacrificing maximum power delivery.
- Patented Canister Shape: Provides increased internal volume for additional sound-absorbing material.
- Patented Chamber Design: Enhances and refines exhaust pressure for application-specific performance.
- Factory Forward Engineering: Centralizes muffler mass and helps reduce vulnerability to crash damage.
- Application-Specific Tuning: Uses optimized core specifications for the compatible Honda CRF450X application.
- Innovative Rear End Cap: Allows simple installation of tuning tip inserts or a spark arrestor.
- Aluminum Construction: Includes an aluminum canister and stainless steel mid-pipe.
- Included Accessories: Comes with a spark arrestor and wash plug.
- Fitment: Compatible with 2005–2009 and 2012–2016 Honda CRF450X models.
Fitment:
2005 Honda CRF450X
2006 Honda CRF450X
2007 Honda CRF450X
2008 Honda CRF450X
2009 Honda CRF450X
2010 Honda CRF450X
2011 Honda CRF450X
2012 Honda CRF450X
2013 Honda CRF450X
2014 Honda CRF450X
2015 Honda CRF450X
2016 Honda CRF450X
2017 Honda CRF450X
2018 Honda CRF450X