534 cfm Airflow Max, Air Filter, Air Filter 49K250 OG1616 Grainger 2.5" SILVER Performance High Flow Cold Air Intake Cone Replacement Dry Close I confirm Vibrant Classic Air Filters Volant Performance 5120D Volant DryTech 3D Clamp On Conical Air Filter Volant Performance 5126D Volant DryTech 3D Clamp On Conical Air Filter. 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.