FMF Factory 4.1 RCT Slip-On Muffler 041602 - Honda CRF450R / CRF450RX 2021-2026

FMF Factory 4.1 RCT Slip-On Muffler 041602 - Honda CRF450R / CRF450RX 2021-2026

Product Description

The FMF Factory 4.1 RCT Slip-On Muffler features Resonance Chamber Technology, incorporating a patented core shape that reduces decibels while preserving maximum power output. Internal ducts within the chambers expand internal volume for better exhaust flow, producing power gains across the entire powerband.

Built using FMF's Factory Forward Engineering to centralize mass and resist crash damage, this muffler pairs a natural stainless steel canister with a carbon fiber end cap. It includes a QuietCore 94 dB insert and a spark arrestor, meeting strict AMA and FIM sound requirements.

Top Features: FMF Factory 4.1 RCT

• RCT (Resonance Chamber Technology) uses a patented core shape that lowers decibels while maintaining maximum power output.
• Internal ducts in the system chambers increase volume for improved exhaust flow and power gains across the entire range.
• Factory Forward Engineering design centralizes mass and reduces vulnerability to crash damage[cite: 1].
• Innovative rear end cap allows easy installation of tuning tip inserts or spark arrestors with the removal of four screws[cite: 1].
• Meets AMA and FIM sound requirements, and includes both a QuietCore 94 dB insert and a spark arrestor[cite: 1].

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Does this slip-on muffler come with a spark arrestor and quiet insert?
A: Yes, it includes both a QuietCore 94 dB insert and a spark arrestor[cite: 1].

Q: Is this slip-on compatible with the stock header?
A: Yes, it is fully compatible with either the stock header or an FMF header[cite: 1].

Expert Pro-Tip

Expert Pro-Tip: Apply a light layer of high-temperature silicone sealant at the slip-joint connection during installation to prevent exhaust leaks. Routinely check the four screws on the carbon fiber end cap to ensure they remain snug under high-revving 4-stroke conditions.

Recommended Pairings:

• Honda 4-Stroke Performance Parts
• Honda CRF450R Performance Parts & Accessories
• Motorcycle Tools & Accessories

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