K&N Engineering knn33-2209

The K&N drop-in High-Flow air filter for Audi A4/RS4/S4 (2001–2009) and Seat Exeo (2009–2010) is a washable, reusable replacement that increases airflow while protecting the engine. Constructed from layered oiled-cotton media to trap contaminants and support improved flow, it installs into the factory air box as a direct replacement. K&N backs the filter with its No‑Hassle Lifetime Limited Warranty.