K&N Engineering knn33-2294

K&N drop‑in High‑Flow air filter for the BMW 545i 4.4L (2003–2005) is a washable, reusable performance replacement designed to improve airflow while protecting the engine. The layered, oiled cotton media is engineered for long life and to reduce disposable filter waste. This direct‑fit filter installs in the factory airbox and is covered by K&N’s lifetime limited warranty for the vehicle’s service life.