The Volant 51905 Pre-Filter is a great add-on to any intake system or performance filter. Recommended when you install any of our CAS Cool Air Scoops or go serious off roading. A Volant Pre-Filter will also benefit you when your truck is consistently around fine powder, sand or rainy weather. This cover protects the filter from splashes of water or saturating the filter in mud. The unique material contains uniform micron openings that filter out debris .005 or larger.