Vibrant Classic Air Filters Vibrant Performance 10925 THE CLASSIC Performance Air Filter, 4" Inlet Vibrant The Classic Performance Air Filter (5.25in O.D. Cone x 5in Tall x 4in inlet I.D.) Vibrant Classic Air Filters Volant 5120 Pro 5 Round Tapered Blue Air Filter (6" F x 7.5" B x 4.. 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.