The FMF Q4 S/A Muffler, manufacturer part number 042388 and vendor part number 042388, is a performance exhaust muffler developed through years of championship off-road racing. Designed for Kawasaki KLX300R motorcycles, this model fits 2020, 2021, 2022, 2023, and 2024 applications. It is engineered as a direct-fit replacement or upgrade and can be used with either the stock Kawasaki header or an FMF header.
Built for off-road performance, the FMF Q4 S/A Muffler delivers a maximum sound output of 96 dB, with most configurations producing less than 93 dB. Its lightweight construction helps reduce weight compared with the stock muffler, supporting improved handling and reduced overall vehicle mass. A built-in spark arrestor is included for trail use, while the design allows for convenient repacking to simplify routine exhaust maintenance.
Fitment: 2020-2024 Kawasaki KLX300R. Brand: FMF. Model: Q4 S/A Muffler. Manufacturer part number: 042388. Vendor part number: 042388. 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. Verify motorcycle fitment and applicable sound and emissions requirements before installation.
Features:
- Championship-developed off-road exhaust performance
- Maximum sound output of 96 dB; most models produce less than 93 dB
- Lighter than the stock muffler
- Compatible with the stock Kawasaki header or an FMF header
- Built-in spark arrestor included
- Easy-to-repack design for simplified maintenance
- Fits 2020-2024 Kawasaki KLX300R models
- Not legal for use in California on pollution-controlled vehicles; race use only in California, with waiver availability
Fitment:
2020 Kawasaki KLX300R
2021 Kawasaki KLX300R
2022 Kawasaki KLX300R
2023 Kawasaki KLX300R
2024 Kawasaki KLX300R