aFe Power Magnum FORCE 54-10691 BMW X5 (E53) Performance Intake System (Oiled, 5-Layer Filter) Outflows the factory intake by up to 31% . 5-Layer progressively finer oiled, washable cotton gauze media allows maximum airflow for maximum power 16 gauge, one-piece powder-coated heat shield Unique precision machined, billet aluminum 3-angle adaptor This product is 50-state legal for 2001-2005 models (CARB E.O Number D-550-3)