Vibrant Performance classic standard air filters feature a 4ply pleated cotton - gauze element 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 air filters are an excellent choice for turbo charged applications and are available in Inlet I.D. Diameters ranging from 2.25 to 4.5.