KTM · PowerParts · Exhaust systems
The KTM FMF Factory 4.1 RCT Silencer is a performance-focused exhaust silencer designed for 4-stroke offroad use. This Grey silencer (part number A48005981003) features a silencer housing made of high-grade aluminum paired with a carbon silencer cap, delivering a substantial weight saving along with a noticeable performance enhancement.
Built to add significantly more torque, it’s a strong choice for riders looking for improved rideability and a sharper power character. Installation flexibility is also a key benefit, with mounting possible when using the original header. See the specifications below for listed materials and approvals.
Construction
The silencer combines a high-grade aluminum housing with a carbon silencer cap, providing a lightweight construction aimed at performance riding. The design supports a substantial weight saving while maintaining a purpose-built setup for 4-stroke offroad applications.
Performance
Engineered to deliver significantly more torque, this silencer is intended to sharpen response and improve the overall feel of the power delivery. The result is a noticeable performance enhancement geared toward competitive offroad and closed-course use.
Installation
Mounting is also possible with the original header, helping streamline installation decisions for riders who want to keep their existing header in place. For those using an FMF Megabomb header, the manufacturer notes the potential for an even further increase in rideability and power output.
Performance
The FMF Factory 4.1 RCT Silencer is focused on delivering real riding benefits through a combination of reduced weight and stronger output. KTM lists a substantial weight saving along with a noticeable performance enhancement, with significantly more torque as a key result. This balance is aimed at riders who prioritize quicker feel and improved rideability in offroad conditions while keeping the exhaust system purpose-driven for competition environments.
Construction
Materials and construction are chosen with performance in mind. The silencer housing is made of high-grade aluminum, and the silencer cap is carbon. The specifications also list Carbon and Stainless steel as the materials for this product, supporting a lightweight, race-oriented exhaust component intended for demanding offroad use.
| Part Number | A48005981003 |
|---|---|
| Product Line | KTM PowerParts |
| Category | Exhaust systems > 4-stroke Offroad |
| Colour | Grey |
| Materials | Carbon, Stainless steel |
| Approvals | AMA Amateur, FIM, CCCUO |
| Model — Model Years |
|---|
| 450 EXC-F — 2024–2027 |
| 450 EXC-F 6DAYS — 2027 |
| 450 EXC-F 6Days — 2026 |
| 450 EXC-F Champion Edition — 2025 |
| 450 EXC-F Six Days — 2024–2025 |
| 450 SMR — 2023–2027 |
| 450 SX-F — 2023–2027 |
| 450 SX-F Factory Edition — 2022–2026 |
| 450 XC-F — 2023–2027 |
| 450 XCF-W — 2023–2027 |
| 500 EXC-F — 2024–2027 |
| 500 EXC-F 6DAYS — 2026–2027 |
| 500 EXC-F 6Days — 2026 |
| 500 EXC-F Champion Edition — 2025 |
| 500 EXC-F Six Days — 2024–2025 |
Vehicle compatibility as captured from KTM for article number A48005981003.
KTM approval notice: AMA Amateur racing sound compliant.
KTM approval notice: Closed Course Competition Use Only.
KTM approval notice: FIM Pro racing sound compliant.
