aFe Power Magnum FORCE 54-11602 BMW Z4 3.0Si (E85/86) Performance Intake System (Oiled, 5-Layer Filter) Outflows the factory intake by up to 45% . Produces an additional 7 horsepower and 7 lbs. x ft. torque 5-Layer progressively finer oiled, washable cotton gauze media allows maximum airflow for maximum power 16 gauge, one-piece powder-coated heat shield Heat-insulating molded plastic tubes replace the stock intake tract This product is not CARB exempt at this time and is not legal for sale in California or use on vehicles registered with the California Department of Motor Vehicles.