Bike Fitment:

• Yamaha YZ450F 2018–2025
  
• Yamaha YZ450F 50th Anniversary Edition 2024
• Yamaha YZ450F Monster Energy Yamaha Racing Edition 2023
• Yamaha YZ450F Monster Energy Yamaha Racing Edition 2025
• Yamaha YZ450FX 2019–2025

If you're a rider looking for a silencer that's packing stellar looks and increased performance from a staple brand in motorsports, the FMF Factory 4.1 RCT Aluminum Silencer with Carbon End Cap is an option that we think sits close to the top of the class.

FMF distinguishes their 4.1 RCT from other silencers from the start by using premium materials and a refined design developed over years of industry experience. Features like FMF’s unique Resonance Chamber Technology™ (RCT), a specialized chamber that sits at the front of the slip-on, lowers your exhaust decibel level so it complies with FIM 2M max sound tests and the stringent AMA sound requirements so you can get onto any trail and into any race where noise level regulations are enforced.

While the RCT lowers sound, what's better is that it won't eat up your bike's power either. In Fact the RCT chamber design refines and enhances exhaust pressure to give your bike gains throughout the rpm range. Power increases are tunable as well with the end cap housing FMF's new Rapid Tuning System (RTS) that lets you swap between race tips (sold seperately) and the 94 db Quiet Core insert. With this level of performance and versatility FMF's Factory 4.1 RCT Silencers really do serve as an excellent option for all types dirt and off-road riders.

Specs:

• Premium aluminum alloy canister body
• Genuine carbon fiber composite end cap
• Rapid Tuning System (RTS) allows for swapable end cap inserts (sold seperately)
• Compatible with FMF and OEM headers
• Resonance Chamber Technology (RCT) lowers sound and refines exhaust gas pressure
• Increases performance throughout the rpm range
• Efficient design centralizes mass and makes silencer body less prone to damage in a crash
• Increased packing material volume in main body canister
• Meets AMA and FIM sound regulations and requirements
• Quiet Core 94db end cap insert included
• USFS spark arrestor included and pre-installed in silencer
• Easily removable end cap for quick servicing and repacking
• Available in various finishes and end cap materials