FMF Factory 4.1 RCT Slip-On Muffler

Upgrade your motorcycle's exhaust system with the FMF Factory 4.1 RCT Slip-On Muffler, engineered to deliver championship-proven performance and advanced sound management. This premium performance muffler is designed for riders seeking significant power gains across the entire RPM range.

Description

The FMF Factory 4.1 RCT Slip-On Muffler is a top-tier upgrade for serious riders, incorporating cutting-edge Resonance Chamber Technology (RCT). This patented core shape is meticulously engineered to lower decibel levels while simultaneously maintaining and even increasing maximum power output. The RCT exhaust system features internal ducts within its chambers, strategically increasing internal volume for superior exhaust flow. This innovative design translates directly into noticeable power gains throughout the entire range of power, from low-end grunt to high-RPM scream.

FMF's commitment to performance and durability is further exemplified by its Factory Forward Engineering. This design philosophy centralizes mass, contributing to improved handling dynamics and making the muffler less prone to crash damage during aggressive riding. The innovative rear end cap is a testament to user-friendly design, allowing for simple, tool-less installation of tuning tip inserts or a spark arrestor with the removal of just four screws. This titanium slip-on muffler is compatible with both stock headers and FMF performance headers, offering versatile integration into your existing setup. Each FMF Factory 4.1 RCT Slip-On Muffler includes a QuietCore 94 dB insert and a spark arrestor, ensuring compliance with AMA and FIM sound requirements (pre-2025 regulations). Available in striking natural titanium or blue anodized finishes, with options for titanium or carbon fiber end caps, this FMF exhaust upgrade combines aesthetics with unparalleled performance.

Features & Highlights

• Resonance Chamber Technology (RCT): Patented core design lowers decibels while maximizing power output for a balanced performance muffler.
• Enhanced Exhaust Flow: Internal ducts increase volume, resulting in significant power gains across the entire powerband.
• Factory Forward Engineering: Centralizes mass for improved handling and increased resistance to crash damage.
• Innovative End Cap Design: Allows for simple, tool-less installation of tuning tips or spark arrestor.
• Versatile Compatibility: Seamlessly integrates with both stock and FMF aftermarket headers.
• Complete Package: Includes QuietCore 94 dB insert and spark arrestor for immediate use and compliance.
• Premium Finishes: Available in natural titanium or blue anodized, with titanium or carbon fiber end cap options.

Technical Specifications

• Brand: FMF
• Model: Factory 4.1 RCT
• Product Type: Slip-On Muffler
• Sound Technology: Resonance Chamber Technology (RCT)
• Sound Compliance: Meets AMA and FIM (pre-2025) sound requirements
• Included Inserts: QuietCore 94 dB insert, Spark Arrestor
• Compatibility: Stock or FMF headers
• Material/Finish Options: Natural titanium, blue anodized finish; titanium or carbon fiber end caps

Important to Know

• Will not pass 2025 FIM sound regulation.

Free shipping to GLS parcel shop parcel box for purchases over DKK 1,000.

GLS home delivery costs DKK 59.

We do our best to ship your order as quickly as possible. All orders are generally packed within 24 hours on weekdays.

There is a 14-day return policy. Read more