Uni Filter NU-4103ST Two-Stage Air Filter Honda Dirt Bike

The Uni Filter NU-4103ST is a high-performance replacement air filter engineered specifically for Honda dirt bikes. This premium two-stage air filter is designed to fit in the factory air box exactly like the original equipment filter, ensuring a perfect seal and hassle-free installation.

Key Features:

• Unique two-stage design with dual layers of foam that can be serviced separately for maximum airflow and ultimate cleaning
• Thin Ultra Seal base with built-in grease groove that is virtually impossible to tear
• Unsurpassed airflow, dirt-stopping capability, and overall performance
• Trusted by factory Yamaha, Kawasaki, and Suzuki off-road racing teams
• Clean easily with grease-cutting dishwashing detergent—oil and reuse indefinitely
• Made in the U.S.A.

The NU-4103ST is the best-selling replacement air filter for competition motorcycles and ATVs, delivering superior filtration while maintaining optimal engine airflow. The innovative two-stage construction allows the filter to come apart completely, ensuring thorough cleaning and extended service life. Each filter features the Ultra Seal grease groove on the sealing surface to prevent dirt bypass and maintain a secure fit in your stock air box.