Factory 4.1 RCT Exhaust Silencer 19-26 Yamaha WR YZ 250 F FX - FMF 044453

The FMF Racing Factory 4.1 RCT Slip-On is engineered for riders seeking the ultimate blend of mass centralisation, power, and durability. Developed with FMF's proprietary Resonance Chamber Technology™ and Factory Forward Engineering, this system utilises aerospace-grade materials, delivering both weight reduction and exceptional strength. The short, robust design improves mass centrality and decreases the risk of crash damage, while a carbon end cap and stainless steel midpipe ensure outstanding longevity and aesthetics. Manufactured entirely at FMF’s Southern California facility, this premium slip-on offers serious power gains across the RPM range for demanding off-road applications.

Features

• Closed course competition use only for maximum performance


• Robust slip-on configuration with single outlet


• Aerospace-grade aluminium construction with carbon fibre end cap for strength and lightweight


• Rapid Tuning System (RTS) streamlines setup and adjustments


• Reduced weight improves handling (7.8 lbs)


• Substantial power and torque enhancements across all revs


• Includes screen-type spark arrestor and 94dB quiet insert


• Premium stainless steel midpipe for resilience and corrosion resistance

Specifications

• Item ID: 044453


• Type: Slip-On


• Configuration: Single


• Construction: Aluminium


• Finish: Natural


• Midpipe: Stainless Steel


• End Cap: Carbon


• Spark Arrestor: Screen Insert (included)


• Carb Warning: No


• Quiet Insert: 94dB Insert (included)


• Weight: 7.8 lbs

Vehicle Fitment

YAMAHA

• WR250F (2023–2024)


• YZ250F (2019–2026)


• YZ250FX (2020–2026)