aFe Power Magnum FORCE 54-31662 BMW M3 (E9X) Performance Intake System (Oiled, 5-Layer Filter) Outflows the factory intake by up to 41% . Produces an additional 12 horsepower and 9 lbs. x ft. torque 5-Layer progressively finer oiled, washable cotton gauze media allows maximum airflow for maximum power Uses the factory intake box to seal the intake tube and filter against unwanted underhood temperatures Dyno tuned intake tube 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.