Factory 4.1 RCT Exhaust Silencer 25-26 Honda CRF 250 R RX - FMF 041618

The FMF Factory 4.1 RCT is a single slip-on exhaust silencer for the specified Honda CRF250R and CRF250RX models. It replaces the existing muffler without requiring a complete exhaust system. Manufactured in Southern California, USA, it is intended for closed-course use only.

Features

• Resonance Chamber Technology (RCT) uses chambers inside and outside the muffler to manage power delivery and exhaust sound across the RPM range.


• Factory Forward Engineering positions the muffler closer to the engine. Its shorter overall length is designed to centralise mass and reduce exposure to crash damage.


• Lightweight construction is designed to reduce exhaust weight.


• The Rapid Tuning System (RTS) uses a snap ring at the rear end cap to retain standard or optional tuning inserts, allowing insert changes without replacing the muffler.


• Fits with either the stock Honda header or a compatible FMF header.


• Muffler packing can be serviced to help restore performance and reduce sound levels.

Specifications

• Configuration: Single slip-on silencer.


• Muffler material: Aerospace-grade aluminium.


• Midpipe material: Stainless steel.


• End cap material: Carbon fibre.


• Supplied quiet insert rating: 94 dB.

Kit Contents

• Screen-type spark arrestor insert and quiet insert included.


• Exhaust header not included.

Use and Compliance

• Closed-course use only.


• CARB warning: No, as listed in the supplied product information.

Cross-Reference OEM Part Numbers

• FMF: 041618.

Vehicle Fitments

• Honda CRF250R: 2025–2026.


• Honda CRF250RX: 2025–2026.