Vibrant Performance classic standard short air filters feature a 4ply pleated cotton - gauze elements that allows for significantly more airflow than a stock filter while providing excellent filtration of airborne particulate. Each filter is pre - oiled, washable and reusable. Vibrant Performance classic standard short air filters are an excellent choice for turbo charged applications and for use on engine bays where space is limited. They are available in Inlet I.D. Diameters ranging from 3 to 5.