FMF - 044488 - Factory 4.1 RCT Slip-On Muffler - '18-'26 Yamaha YZ450FX, WR450F, YZ450F
Built around FMF's latest Resonance Chamber Technology, the Factory 4.1 RCT slip-on brings full internal and external RCT design to Yamaha models from 2018 through 2026. Its shortened overall length tucks the muffler closer to the engine as part of FMF's Factory Forward Engineering, centralizing mass for sharper handling while reducing exposure to crash damage on rocky trails or tight turns. Every canister is built from aerospace-grade materials and manufactured entirely at FMF's Southern California factory, giving riders a slip-on muffler that's both track-tested and made to last.
Features
- The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally
- Achieves a shorter overall length that is less susceptible to crash damage and complementary to Factory Forward Engineering - moving the muffler closer to the motor to centralize mass
- The Factory 4.1 RCT is constructed from only aerospace grade materials that meet exacting specifications and is manufactured 100% at the Southern California factory
Specs
- End Cap Material: Carbon Fiber
- Muffler Color/Finish: Anodized
- Muffler Material: Titanium
- Units: Each
- Product Name: Muffler
- Type: Slip-On
- Pipe Material: Titanium
- Riding Style: Off-Road
- Model: Factory 4.1 RCT
- Muffler Color/Finish: Blue
- End Cap Color/Finish: Blue
Frequently Asked Questions - FMF - 044488 - Factory 4.1 RCT Slip-On Muffler - '18-'26 Yamaha YZ450FX, WR450F, YZ450F
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
