FMF
Factory 4.1 RCT Slip-On Muffler - Stainless Steel/Aluminum with Carbon Fiber End Cap - YZF/FX
Part # 1821-1838
$649.99
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Confirmed fit for 16 motorcycle configurations across Yamaha, model years 2018–2026.
| Years | Make & Model |
|---|---|
| 2019-2025 | Yamaha YZ450FX |
| 2018-2026 | Yamaha YZ450F |
- RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output
- Internal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow, resulting in power gains throughout the entire range of power
- FMF's Factory Forward Engineering centralizes mass and is less prone to crash damage
- Innovative rear end cap features simple installation of tuning tip inserts or spark arrestor with the removal of four screws
- Compatible with stock header or FMF header
- Meets AMA and FIM sound requirements
- QuietCore 94 dB insert included
- Spark arrestor included in muffler
- Made in the USA
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Overview
The FMF 1821-1838: Factory 4.1 RCT Slip-On Muffler - Stainless Steel/Aluminum with Carbon Fiber End Cap - YZF/FX. Confirmed fit for 16 motorcycle configurations across Yamaha, model years 2018–2026. Ships from Greasemoto — a veteran-owned motorcycle parts shop in Fort Worth, TX — with free U.S. shipping on orders over $100.
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