Factory 4.1 RCT Exhaust Silencer 16-18 Kawasaki KX 450 F - FMF 042330

Engineered for race-focused riders, the FMF Racing Factory 4.1 RCT Stainless SL Slip-On exhaust with carbon end cap features advanced Resonance Chamber Technology™ to optimise exhaust flow for greater power across the rev range. Its innovative Factory Forward Engineering positions the muffler closer to the engine for centralised mass and improved handling, while the aerospace-grade construction and streamlined length offer increased durability and significant weight reduction. Meticulously manufactured in Southern California, this slip-on achieves the perfect blend of strength, performance, and modern design for competitive environments.

Features

• Incorporates internal and external Resonance Chamber Technology™ for enhanced power delivery


• Constructed from aerospace-grade aluminium, stainless steel, and proprietary titanium blend


• Factory Forward Engineering for better mass centralisation


• Shorter, stronger design reduces susceptibility to crash damage


• Significant weight savings for agile handling


• Rapid Tuning System (RTS) for quick adjustments


• Carbon fibre end cap for premium finish and durability


• Closed course use only


• Includes spark arrestor (screen insert) and 94dB quiet insert


• Proudly made in the USA

Specifications

• Item ID: 042330


• Type: Slip-on


• Configuration: Single


• Construction: Aluminium muffler with stainless steel midpipe and carbon end cap


• Finish: Natural


• Included: Spark arrestor (screen insert), 94dB quiet insert


• Weight: 5.1 lbs (2.3 kg)


• Not for road use (closed course only)


• Compatible with specific header systems (see vehicle fitment)

Vehicle Fitment

Kawasaki

• KX450F (2016–2018)