Factory 4.1 RCT Exhaust Silencer 09-11 Kawasaki KX 450 F - FMF 042291

The Factory 4.1 RCT Stainless SL Slip-On with Carbon End Cap delivers advanced performance with FMF’s Resonance Chamber Technology™, optimising power output and mass centralisation for professional-level racing. Built from top-tier aerospace grade materials at FMF’s Southern California facility, this slip-on exhaust offers substantial weight savings, improved crash resilience and the latest Rapid Tuning System for seamless adjustments. Its precise engineering ensures reduced overall length and an optimally positioned muffler for enhanced handling and durability.

Features

• Incorporates both internal and external FMF Resonance Chamber Technology™


• Shorter, forward-positioned muffler design for centralised mass and reduced crash vulnerability


• Constructed from aerospace grade aluminium and stainless steel with carbon fibre end cap


• Massive power gains across the RPM range


• Significant weight reduction over stock systems


• Includes Rapid Tuning System (RTS) for quick adjustments


• Natural aluminium finish with carbon end cap for strength and style


• Screen-type spark arrestor insert and 94dB quiet insert included


• Manufactured 100% in FMF’s Southern California factory


• For closed course competition use only

Specifications

• Item ID: 042291


• Type: Slip-On


• Configuration: Single


• Construction: Aluminium


• Finish: Natural


• Midpipe: Stainless steel


• Endcap: Carbon fibre


• Spark Arrestor: Screen insert (included)


• Quiet Insert: 94dB insert (included)


• Weight: 5 lbs (approximate)


• Carb Warning: No

Vehicle Fitment

Kawasaki

• KX450F (2009–2011)