Factory 4.1 RCT Slip-On Exhaust Silencer 18-26 Yamaha 450 WR YZ F FX - FMF 044443

Engineered for serious performance, the FMF Racing Factory 4.1 RCT Stainless Slip-On with Carbon End Cap delivers cutting-edge power gains and significant weight savings for competitive riders. Utilising FMF Resonance Chamber Technology™ internally and externally, this slip-on muffler shortens overall length to reduce crash vulnerability and enhances mass centralisation, thereby improving handling. Crafted with aerospace-grade aluminium, stainless steel, and a carbon fibre end cap, each unit is manufactured entirely at FMF’s Southern California facility for uncompromising quality and reliability.

Features

• Advanced FMF Resonance Chamber Technology™ for improved exhaust efficiency and performance
• Factory Forward Engineering for centralised mass and better handling
• Aerospace-grade natural aluminium construction with durable carbon fibre end cap
• Significant power gains across the RPM spectrum
• Noticeably lighter than stock systems for enhanced agility
• 94dB quiet insert and spark arrestor (screen type) included for versatility
• New Rapid Tuning System (RTS) for quick adjustments
• Closed course use only

Specifications

• Item ID: 044443
• Type: Slip-On
• Configuration: Single
• Construction: Aluminium (muffler), Stainless Steel (midpipe), Carbon Fibre (end cap)
• Finish: Natural
• Includes: Screen insert spark arrestor, 94dB quiet insert
• Carb Warning: No

Vehicle Fitment

YAMAHA

• WR450F (2019–2024)
• YZ450F (2018–2026)
• YZ450FX (2019–2025)