Upgrade your motorcycle’s exhaust performance with the FMF Factory Fatty Pipe, manufacturer part number 025239. Designed for select KTM, Husqvarna, and GasGas 2-stroke motorcycles, this performance expansion chamber is engineered to improve power delivery while maintaining the responsive characteristics riders expect from a competition-focused exhaust system. The Factory Fatty design is built for riders seeking stronger throttle response and improved engine performance across a broad operating range.
This FMF pipe is a direct-fit replacement for the listed applications and is suited to motocross and off-road use. Its carefully developed expansion-chamber profile helps optimize exhaust flow and supports usable power throughout the rev range. The durable construction is designed to withstand the demands of aggressive riding, while the FMF branding reflects the company’s longstanding focus on high-performance motorcycle exhaust components.
Fitment includes the 2019–2021 Husqvarna TC 125, 2019–2021 KTM 125 SX, 2019–2021 KTM 150 SX, and 2021 GasGas MC 125. Verify the motorcycle year, model, engine configuration, and existing exhaust components before ordering. The FMF Factory Fatty Pipe 025239 is a performance exhaust component intended for compatible 2-stroke applications and should be installed according to the manufacturer’s recommendations.
Features:
- Brand: FMF
- Manufacturer Part Number: 025239
- Vendor Part Number: 78-1545F
- Product Type: Factory Fatty performance expansion chamber
- Engine Type: 2-stroke
- Fitment: 2019–2021 Husqvarna TC 125
- Fitment: 2019–2021 KTM 125 SX
- Fitment: 2019–2021 KTM 150 SX
- Fitment: 2021 GasGas MC 125
- Performance: Designed to improve throttle response and usable power delivery
- Installation: Direct-fit replacement for compatible motorcycle applications
Fitment:
2019 Husqvarna TC 125
2019 KTM 125 SX
2019 KTM 150 SX
2020 Husqvarna TC 125
2020 KTM 125 SX
2020 KTM 150 SX
2021 Gas-Gas Mc 125
2021 Husqvarna TC 125
2021 KTM 125 SX
2021 KTM 150 SX
2022 Gas-Gas Mc 125
2022 Husqvarna TC 125
2022 KTM 125 SX
2022 KTM 150 SX
2023 Gas-Gas Mc 125