FMF Racing Factory 4.1 RCT Slip-On Exhaust 045629 — Titanium Blue with Carbon End Cap

Unleash broader power and crisper throttle response with the Factory 4.1 RCT Slip-On (045629), engineered for 350–450cc KTM, Husqvarna, and GasGas models from 2018–2023. The blue anodized titanium muffler pairs with a carbon end cap for a race-ready look that stays durable under demanding riding conditions.

FMF’s Resonance Chamber Technology is applied both inside and outside the system to improve exhaust flow and efficiency across the entire RPM range. Coupled with Factory Forward Engineering, the muffler is moved closer to the motor to centralize mass and reduce crash vulnerability, contributing to steadier handling and a more consistent feel on every turn and jump.

The 4.1 RCT introduces the RTS (Rapid Tuning System) for quick, track-side tuning adjustments, letting you fine‑tune performance without a full disassembly. Built from lightweight, aerospace-grade titanium, the assembly delivers significant weight savings while maintaining strength and durability in challenging environments.

Designed for straightforward installation with compatible mounting hardware, this slip‑on delivers a distinct FMF sound and a measurable uptick in engine efficiency, making it a popular upgrade for riders seeking reliable performance gains in both trail and race settings. It’s manufactured 100% at FMF’s Southern California factory to exacting standards.

• Fits 350–450cc KTM/Husqvarna/GasGas, 2018–2023
• Blue anodized titanium muffler with carbon end cap
• Resonance Chamber Technology for improved flow
• RTS Rapid Tuning System for quick adjustments
• Factory Forward Engineering centralizes mass
• Lightweight aerospace-grade titanium construction
• Easy installation with compatible mounting hardware

The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our Factory Forward Engineering - moving the muffler closer to the motor to centralize mass. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet our exacting specifications and is manufactured 100% at our Southern California factory.

-Available in Blue Anodized Titanium Muffler with Carbon End Cap 

-Massive Power gains throughout the RPM range.

-Huge weight savings

-New RTS (Rapid Tuning System)

-FMF uses the highest quality proprietary blend of alloy grade titanium made specifically to our standards.

Upgrade your motorcycle's performance with the FMF Racing Factory 4.1 RCT exhaust system. Designed for optimal power delivery and durability, this exhaust enhances engine efficiency while providing a high-quality sound. Constructed with precision and attention to detail, the Factory 4.1 RCT is a popular choice among riders seeking reliable performance improvements.

The FMF Racing Factory 4.1 RCT features a lightweight design that reduces overall bike weight, contributing to better handling and acceleration. Its durable materials ensure longevity even under demanding riding conditions. The exhaust system is engineered to improve exhaust flow, resulting in increased horsepower and torque across a broad RPM range. Its sleek finish and robust construction make it a perfect upgrade for competitive riders and enthusiasts alike.

Installation is straightforward with compatible mounting hardware, and the system is designed to fit specific motorcycle models seamlessly. Whether you're looking for enhanced performance on the trail or in the race arena, the FMF Racing Factory 4.1 RCT is engineered to deliver consistent, high-quality results. Trust FMF Racing's reputation for innovation and quality to elevate your riding experience.

Features:

• Lightweight construction reduces overall bike weight

• Durable materials for long-lasting performance

• Improves exhaust flow for increased horsepower and torque

• Engineered for seamless fit and easy installation

• Enhances engine efficiency and sound quality