FMF 043377 KLX/DR-Z400S Slip-On Muffler

FMF 043377 is a Q4 slip-on muffler designed to manage exhaust sound while supporting the performance characteristics of compatible Kawasaki KLX and Suzuki DR-Z400S motorcycles. The Q series uses a twin-stage core design to reduce sound output and help extend packing service life, while its reduced mass supports the motorcycle’s power-to-weight ratio. The muffler is developed from FMF’s off-road racing experience and is intended for riders seeking controlled exhaust volume without removing the engine’s performance response. A spark arrestor is included as standard equipment for applicable off-road use.

The construction material and country of manufacture are not specified in the supplied product data. The internal baffle and chamber layout is engineered to manage exhaust flow and sound absorption. The slip-on configuration is intended to replace the compatible original muffler section while using the motorcycle’s existing exhaust system components where applicable. Verify installation requirements, local sound regulations, and off-road equipment requirements before purchase.

The package includes one FMF Q4 slip-on muffler with a standard spark arrestor. No mounting hardware, replacement packing, or additional components are listed in the supplied product information. Confirm the contents against the installation instructions before beginning service. Proper installation should include inspection of mounting points, exhaust joints, fasteners, and clearance from nearby components.

Fitment Chart

Please confirm your year, make, and model before purchasing. Contact Moto-House MX if you need fitment assistance.

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Features:

• Q series muffler design manages exhaust sound

• Twin-stage core design supports lower sound output

• Reduced mass supports the power-to-weight ratio

• Developed through off-road racing experience

• Standard spark arrestor included

• Slip-on configuration for compatible KLX and DR-Z400S applications