Outerwears created a nylon pre-filter material that guards against big particles but does not interrupt the flow of air. Outerwears pre-filters come in a diverse range of shapes and sizes and are available in a number of colors.  Racecar Engineering™ is proud to distribute and support the entire Outerwears™ Performance Products product line.  Shop here online now for the most popular items from Outerwears™ Performance Products.  Always remember, if you don't find what you need on here our website, we'll gladly special order the item for you directly from the factory.  Please contact our Technical Sales staff for complete information.