The K&N 33-2005 sport air filter is a high-quality air filter designed to fit directly into the factory airbox. This filter is an ideal choice for those looking to enhance their vehicle's engine performance and efficiency without major modifications.Benefits:Increased Airflow: The K&N 33-2005 filter provides 30-40% more airflow compared to stock paper filters, improving engine breathing and boosting performance.Durable Materials: Made from a multi-layer, oiled cotton construction that ensures long lifespan and easy maintenance.Direct Replacement: Easily fits into the factory airbox with no need for modifications.Environmentally Friendly: Washable and reusable, reducing the need for frequent filter replacements.Features:Filter Material: Multi-layer oiled cotton structure that effectively filters the air while ensuring maximum airflow.Lifespan: Does not require replacement during its lifespan, only periodic cleaning.Dimensions: Length: 318 mm, Width: 179 mm, Height: 33 mmCompatibility:The K&N 33-2005 sport air filter is suitable for the following vehicle models:BMW E30 M3 (1986-1992)BMW 320i, 323i, 325e, 325iBMW 520i, 525e, 525iBMW 628CSi, 633CSi, 635CSi (1978-1990)Zastava 101 1.3L (1981-1993)An excellent choice for those seeking a reliable and efficient filter for their vehicle.