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The pre-filters are recommended when you install any of our CAS (Cool Air Scoops), or do some serious off roading. Also, if your work truck is consistently around find powder, sand, or rainy weather, put one of these on and your engine will thank you. These covers protect your 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.