FMF Racing FMF044489 Yamaha YZ450F 2023-2025 Factory 4.1 RCT Exhaust System

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our 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 our exacting specifications and is manufactured 100% at our Southern California factory.

• Highest-quality proprietary blend of alloy grade titanium
• Blue anodized titanium muffler with carbon end cap
• Massive power gains throughout the RPM range
• Rapid Tuning System (RTS)

The FMF Racing Factory 4.1 RCT exhaust system incorporates FMF Resonance Chamber Technology™ internally and externally to deliver massive power gains throughout the RPM range. Its shorter overall length helps reduce susceptibility to crash damage, while Factory Forward Engineering positions the muffler closer to the motor to centralize mass.

Constructed entirely from aerospace-grade materials and manufactured at FMF Racing’s Southern California factory, the system features a proprietary alloy-grade titanium construction, a blue anodized titanium muffler, and a carbon end cap. The Rapid Tuning System (RTS) is also included as part of the Factory 4.1 RCT design.

Key Features & Performance Benefits

• FMF Resonance Chamber Technology™: Incorporated internally and externally for performance-focused exhaust design.
• Factory Forward Engineering: Moves the muffler closer to the motor to centralize mass.
• Shorter Overall Length: Designed to be less susceptible to crash damage.
• Rapid Tuning System (RTS): Provides the system’s stated tuning feature.

Key Product Specifications & Technical Data

• Brand: FMF Racing
• Part Number: FMF044489
• Product Type: Powersports exhaust system
• Series: Factory 4.1 RCT
• Construction: Proprietary blend of alloy-grade titanium
• Muffler Finish: Blue anodized titanium
• End Cap: Carbon
• Manufacturing Location: Southern California, USA

What’s Included in the Box

• One FMF Racing Factory 4.1 RCT exhaust system

Fitment

Fits 2023 Yamaha YZ450F, 2023 Yamaha YZ450F Monster Energy Yamaha Racing Edition, 2023 Yamaha YZ450FX, 2024 Yamaha WR450F, 2024 Yamaha YZ450F, 2024 Yamaha YZ450F 50th Anniversary Edition, 2024 Yamaha YZ450FX, 2025 Yamaha WR450F, 2025 Yamaha YZ450F, and 2025 Yamaha YZ450F Monster Energy Yamaha Racing Edition.

Fitments:
2023 Yamaha YZ450F Base
2023 Yamaha YZ450F Monster Energy Yamaha Racing Edition Base
2023 Yamaha YZ450FX Base
2024 Yamaha WR450F Base
2024 Yamaha YZ450F Base
2024 Yamaha YZ450F 50th Anniversary Edition Base
2024 Yamaha YZ450FX Base
2025 Yamaha WR450F Base
2025 Yamaha YZ450F Base
2025 Yamaha YZ450F Monster Energy Yamaha Racing Edition Base
2025 Yamaha YZ450FX Base
2026 Yamaha WR450F Base
2026 Yamaha YZ450FX Base

Air Freight Prohibited: false
Not Carb Approved: false
Carb Acknowledgement Required: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Units Per Sku: 1
Regular Stock: t