The FMF Factory 4.1 RCT slip-on muffler is engineered for select Honda CRF450R and CRF450RX models from 2021 through 2025. Manufacturer part number 041602, also identified by vendor part number 79-041602, this exhaust system incorporates FMF Resonance Chamber Technology to reduce sound output while maintaining strong power delivery. Its patented core shape helps control noise without sacrificing performance, while the chamber design refines exhaust pressure for optimized engine response.
The FMF Factory 4.1 RCT features Factory Forward Engineering, which centralizes mass and helps reduce exposure to crash damage. The tuned exhaust uses application-specific core specifications for the Honda CRF450 platform, and its innovative rear end cap allows simple installation of tuning tip inserts or a spark arrestor. This configuration uses an aluminum canister with a stainless steel mid-pipe, providing a practical balance of performance, durability, and weight for off-road riding.
Included equipment consists of a spark arrestor and wash plug, helping support trail compliance and routine maintenance. This FMF muffler is designed to fit the 2021 Honda CRF450R, 2021 Honda CRF450RX, 2022 Honda CRF450R, 2022 Honda CRF450RX, 2023 Honda CRF450R, 2023 Honda CRF450RX, 2024 Honda CRF450R, 2024 Honda CRF450RX, 2025 Honda CRF450R, and 2025 Honda CRF450RX. Verify the motorcycle model and year before installation to ensure proper fitment.
Features:
- Resonance Chamber Technology: Uses FMF's latest chamber technology to help lower sound levels while preserving power output.
- Patented Core Shape: Controls exhaust sound while supporting strong engine performance.
- Patented Canister Shape: Increases internal volume for additional sound-absorbing material.
- Patented Chamber Design: Enhances and refines exhaust pressure for application-specific performance.
- Factory Forward Engineering: Centralizes muffler mass and helps reduce potential crash damage.
- Tuned Exhaust: Uses optimized core specifications for the Honda CRF450R and CRF450RX applications.
- Rear End Cap: Supports simple installation of tuning tip inserts or a spark arrestor.
- Construction: Features an aluminum canister and stainless steel mid-pipe.
- Included Components: Includes a spark arrestor and wash plug.
- Fitment: Fits 2021-2025 Honda CRF450R and CRF450RX models.
- Manufacturer Part Number: FMF 041602.
- Vendor Part Number: 79-041602.
Fitment:
2021 Honda CRF450R
2021 Honda CRF450RX
2022 Honda CRF450R
2022 Honda CRF450RX
2023 Honda CRF450R
2023 Honda CRF450RX
2024 Honda CRF450R
2024 Honda CRF450RX
2025 Honda CRF450R
2025 Honda CRF450RX
2026 Honda CRF450R
2026 Honda CRF450RX