Uni Filter NU-1421ST Multi-Stage Competition Air Filter

The Uni Filter NU-1421ST is a premium two-stage foam air filter engineered for high-performance motorcycles and ATVs. This competition-grade replacement filter is trusted by factory racing teams and designed to deliver superior airflow and filtration in demanding off-road conditions.

Key Features:

• Unique two-stage foam design with dual layers that can be serviced separately for thorough cleaning
• Precision-engineered to fit factory air boxes exactly like the original equipment filter
• Ultra Seal grease groove base prevents dirt bypass and is virtually tear-proof
• Thin, flexible sealing base with built-in grease groove ensures secure, leak-free installation
• Proven performance—used by factory Yamaha, Kawasaki, and Suzuki off-road racing teams
• Reusable and washable design reduces long-term maintenance costs

Uni Filter's proprietary foam technology provides exceptional filtration efficiency while maintaining optimal airflow for maximum engine performance. The dual-layer construction allows riders to clean each foam stage independently, extending filter life and ensuring consistent protection in the harshest riding environments.