The FMF Factory 4.1 Muffler is a slip-on muffler for motorcycle, dirt bike and MX riders who want to upgrade their exhaust outlet. It is designed to be installed as part of a complete exhaust setup.

• Brand: FMF
• Product: Factory 4.1 Muffler
• Manufacturer SKU: 042383
• Part Number: 1821-2023
• Category: Mufflers & Silencers

Always check the manufacturer's fitment information to confirm compatibility with your bike before ordering. Always follow local laws, including noise and spark arrestor requirements, when installing and using this product.

• Factory 4.1 muffler available in natural titanium or blue anodized titanium with titanium end caps
• The lightest mufflers available
• Superior power and performance - horsepower improved throughout the rpm range
• Feature exclusive proprietary Chamber Core technology
• Factory Forward Engineering centralizes mass, improves handling
• Made from premium quality American materials
• Customize with performance tuning inserts and spark arrestor module
• Meet AMA sound requirements on most models; inserts available for others

  2021-2026	Kawasaki	KLX140R L	-	-
  2021-2026	Kawasaki	KLX140R	-	-
  2021-2026	Kawasaki	KLX140R F	-	-
  2017-2020	Kawasaki	KLX140G	-	-
  2008-2020	Kawasaki	KLX140	-	-
  2008-2020	Kawasaki	KLX140L