Factory 4.1 RCT Exhaust Silencer 19-23 Kawasaki KX 450 F X - FMF 042371

Designed for high-performance off-road and motocross competition, the FMF Racing Factory 4.1 RCT Titanium Anodized Slip-On with Carbon Cap leverages advanced FMF Resonance Chamber Technology™ for superior power and weight savings. The slip-on muffler features a blue anodised titanium body and carbon end cap, engineered to centralise mass and deliver impressive horsepower gains across the RPM range. Aerospace-grade titanium and 100% American manufacturing ensure unmatched durability and precise fitment for demanding riders.

Features

• Closed course use only


• Lightweight titanium construction with blue anodised finish


• Carbon fibre end cap for enhanced strength and aesthetics


• Significant power gain throughout the RPM range


• Rapid Tuning System (RTS) for quick adjustments


• Shorter overall length for reduced crash susceptibility


• Muffler placement optimised for mass centralisation


• Includes 94dB quiet insert and spark arrestor screen insert


• Precision fitment, manufactured entirely at FMF’s USA facility

Specifications

• Item ID: 042371


• Type: Slip-on


• Configuration: Single


• Construction: Titanium


• Finish: Blue anodised


• Midpipe: Titanium


• Endcap: Carbon fibre


• Spark Arrestor: Screen insert (included)


• Quiet Insert: 94dB insert (included)


• Weight: 7.0 lbs


• NOT CARB compliant; for closed course only

Vehicle Fitment

Kawasaki

• KX450F (2019–2023)


• KX450X (2019–2023)