CATEGORIES HOMEKarting AccessoriesFilters and Pre-Filters Outerwear Prefilter 3.5" x 4", Red Item Number: 115-4TRD Price: $15.40 Add to Cart Description Outerwear Prefilters are the most trusted name in the prefilter business. They increase the life of your engine by keeping out even the smallest dirt particles. Accessories Klotz Fabric Filter Spray Outerwear Prefilter 3.5" x 4", Black Outerwear Prefilter 3.5" x 4", Blue