18-090 Replacement Filter M8 Round ST

This replacement air filter from Arlen Ness is designed specifically for use with Round Stage 1 and Method Series air cleaner assemblies. It features a high-performance synthetic filter media that is naturally water-resistant, often eliminating the need for a rain sock in light conditions. The pleated design maximizes surface area to ensure consistent airflow and optimal filtration for the engine. As a direct replacement part, it allows riders to maintain their existing Arlen Ness intake system without needing to purchase an entirely new kit. The durable construction supports long-term use with proper cleaning. Sold individually.