The FMF Q4 Hex spark arrestor exhaust muffler is engineered for off-road riders who demand strong performance, reduced weight, and dependable trail compliance. Developed through years of championship off-road racing, this FMF exhaust system delivers a maximum sound output of 96 dB, while most applications remain below 93 dB. Its lightweight construction helps reduce weight compared with the stock muffler, supporting improved handling and maneuverability on the trail or track.
Designed for direct compatibility with the stock header or an FMF header, the FMF Q4 Hex features an integrated spark arrestor for off-road use. The muffler is also easy to repack, making routine maintenance more convenient and helping preserve consistent sound control and performance over time. The hexagonal design provides a clean, purposeful appearance while maintaining the rugged construction expected from FMF products.
This FMF Q4 Hex muffler fits 2021–2024 Kawasaki KX250F and KX250X models, including the 2021 Kawasaki KX250X, 2021 Kawasaki KX250F, 2022 Kawasaki KX250F, 2022 Kawasaki KX250X, 2023 Kawasaki KX250F, 2023 Kawasaki KX250X, 2024 Kawasaki KX250F, and 2024 Kawasaki KX250X. Manufacturer part number and vendor part number: 042393. This product is not legal for use in California on pollution-controlled vehicles and is intended for race use in California; a waiver may be available.
Features:
- Championship-developed: Engineered through years of FMF off-road racing experience.
- Sound output: Produces a maximum of 96 dB, with most models below 93 dB.
- Lightweight construction: Weighs less than the stock muffler to support improved handling.
- Header compatibility: Works with the stock header or an FMF header.
- Integrated spark arrestor: Included for off-road riding applications.
- Serviceable design: Easy to repack for convenient maintenance.
- Fitment: Fits 2021–2024 Kawasaki KX250F and KX250X models.
- California use: Not legal for use on pollution-controlled vehicles in California; race use only, with waiver availability.
Fitment:
2021 Kawasaki KX250F
2021 Kawasaki KX250X
2022 Kawasaki KX250F
2022 Kawasaki KX250X
2023 Kawasaki KX250F
2023 Kawasaki KX250X
2024 Kawasaki KX250F
2024 Kawasaki KX250X