FMF - KTM Factory 4.1 RCT Silencer
KTM – FMF Factory 4.1 RCT Silencer
Built for riders who want race-proven performance straight from the factory, the FMF Factory 4.1 RCT Silencer combines cutting-edge design with championship-winning engineering. Using FMF’s Resonance Chamber Technology™ (RCT) inside and out, this system refines exhaust flow to deliver maximum power gains across the entire RPM range — all while keeping sound output controlled and balanced.
The shorter overall length makes it less prone to crash damage and complements FMF’s Factory Forward Engineering, moving the muffler closer to the engine to centralize mass for improved handling. Constructed entirely from aerospace-grade titanium with a carbon fiber end cap, the Factory 4.1 RCT offers incredible strength, reduced weight, and a clean factory look that matches KTM’s performance heritage.
Each unit is hand-built and manufactured 100% in FMF’s Southern California facility, ensuring precise fit and race-level quality from start to finish. Available in a blue anodized titanium finish, it looks as good as it performs — the kind of upgrade that instantly transforms both sound and throttle response.
Why We Like It:
The Factory 4.1 RCT feels like flipping a switch on your KTM’s powerband — smoother throttle response, more pull through the mid-range, and noticeably lighter handling. The build quality is second to none, and the titanium finish paired with a carbon end cap gives it that unmistakable “works bike” look.
Why It’ll Work for You:
If you’re after a silencer that increases power while cutting weight, this is the one. The titanium construction shaves pounds without sacrificing durability, and the RCT design enhances performance throughout the RPM range. The shorter design reduces crash risk, and FMF’s forward engineering helps improve bike balance and control. It’s a smart, performance-focused upgrade that delivers tangible results on the track or trail.
Key Features:
• FMF Resonance Chamber Technology™ (RCT) for optimized power delivery
• Factory Forward Engineering for improved mass centralization
• Aerospace-grade titanium construction for maximum strength and minimal weight
• Blue anodized titanium muffler with carbon fiber end cap
• Shorter overall length reduces crash damage
• Rapid Tuning System (RTS) for easy serviceability
• Huge power gains across the RPM range
• Manufactured 100% in FMF’s Southern California factory
Original: $1,178.00
-70%$1,178.00
$353.40Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
KTM – FMF Factory 4.1 RCT Silencer
Built for riders who want race-proven performance straight from the factory, the FMF Factory 4.1 RCT Silencer combines cutting-edge design with championship-winning engineering. Using FMF’s Resonance Chamber Technology™ (RCT) inside and out, this system refines exhaust flow to deliver maximum power gains across the entire RPM range — all while keeping sound output controlled and balanced.
The shorter overall length makes it less prone to crash damage and complements FMF’s Factory Forward Engineering, moving the muffler closer to the engine to centralize mass for improved handling. Constructed entirely from aerospace-grade titanium with a carbon fiber end cap, the Factory 4.1 RCT offers incredible strength, reduced weight, and a clean factory look that matches KTM’s performance heritage.
Each unit is hand-built and manufactured 100% in FMF’s Southern California facility, ensuring precise fit and race-level quality from start to finish. Available in a blue anodized titanium finish, it looks as good as it performs — the kind of upgrade that instantly transforms both sound and throttle response.
Why We Like It:
The Factory 4.1 RCT feels like flipping a switch on your KTM’s powerband — smoother throttle response, more pull through the mid-range, and noticeably lighter handling. The build quality is second to none, and the titanium finish paired with a carbon end cap gives it that unmistakable “works bike” look.
Why It’ll Work for You:
If you’re after a silencer that increases power while cutting weight, this is the one. The titanium construction shaves pounds without sacrificing durability, and the RCT design enhances performance throughout the RPM range. The shorter design reduces crash risk, and FMF’s forward engineering helps improve bike balance and control. It’s a smart, performance-focused upgrade that delivers tangible results on the track or trail.
Key Features:
• FMF Resonance Chamber Technology™ (RCT) for optimized power delivery
• Factory Forward Engineering for improved mass centralization
• Aerospace-grade titanium construction for maximum strength and minimal weight
• Blue anodized titanium muffler with carbon fiber end cap
• Shorter overall length reduces crash damage
• Rapid Tuning System (RTS) for easy serviceability
• Huge power gains across the RPM range
• Manufactured 100% in FMF’s Southern California factory
