Uni Filter NU-8509ST Multi-Stage Competition Air Filter for Polaris ATV

The Uni Filter NU-8509ST is a high-performance multi-stage competition air filter designed specifically for Polaris ATVs. Built with premium open-cell polyurethane foam, this reusable filter delivers superior filtration and airflow for demanding off-road conditions.

Key Features:

• Multi-stage foam design maximizes dirt-trapping capacity throughout the entire filter depth
• Open-cell polyurethane construction prevents surface loading and maintains airflow
• Specially formulated filter oil suspends on foam strands to capture dirt particles
• Utilizes 80% of filter surface life before requiring maintenance
• Washable and reusable design provides long-term value and performance
• Competition-grade filtration ideal for racing and extreme riding

How It Works:

The filter's open-cell foam structure is treated with sticky filter oil that traps dirt particles on contact. As outer layers capture debris, downstream foam strands continue filtering, utilizing the full thickness of the material. This progressive filtration prevents air restriction while maximizing dirt capacity. When cleaning is needed, simply wash the filter, re-oil, and reinstall for continued protection.

Engineered for Polaris ATV applications where maximum engine protection and performance are essential.