FMF Factory 4.1 RCT Exhaust Silencer 25-25 Kawasaki KX 250 F X - FMF 042411

Designed for riders demanding top-tier performance and engineering, the FACTORY 4.1 RCT Stainless Slip-On with Carbon End Cap leverages FMF's advanced Resonance Chamber Technology™, offering internal and external enhancements for optimal power delivery. Its compact construction reduces crash susceptibility while centralising mass with a forward-mounted design. Manufactured entirely in Southern California from aerospace-grade materials, this slip-on provides substantial power gains across the RPM range and impressive weight savings, making it an ideal choice for competitive racers.

Features

• Suitable exclusively for closed course use
• Incorporates FMF’s signature Resonance Chamber Technology™
• Compact, crash-resistant design with forward muffler positioning to centralise mass
• Aerospace-grade alloy and stainless steel construction
• Carbon end cap for lightweight strength and durability
• Aluminium muffler with a grey anodised finish
• Rapid Tuning System (RTS) for quick adjustments
• Massive power gains throughout the RPM range
• Includes 94dB quiet insert and screen-type spark arrestor

Specifications

• Item ID: 042411
• Type: Slip-On
• Configuration: Single
• Construction: Aluminium
• Finish: Grey Anodised
• Midpipe: Stainless Steel
• Endcap: Carbon
• Spark Arrestor: Screen insert (included)
• Quiet Insert: 94dB insert (included)
• Carb Warning: Not applicable

Vehicle Fitment

Kawasaki

• KX250F (2025)
• KX250X (2025)

Supplier SKU: 07-4004.F41.A. Supplier availability is subject to change.

Why Buy From FDY Performance?

Shop with FDY Performance Ltd, a UK-based motorcycle parts and accessories retailer. We offer friendly product support and UK delivery options. Please check your bike make, model and year against the fitment information before ordering.