aFe MagnumSHIELD Pre-Filters P/F: 24-91042/21-90058/72-90058 (Black)aFe Filter GUARD Pre Filters protect your performance air filter and extends your filter cleaning intervals by removing large particles from the air stream prior to the air filter. This pre filter does not restrict air flow and is made of a dry weave fabric that does not attract dirt and cleans with soap and water. Magnum SHIELD Pre Filter For use with skus ending in XX 90058 Black aFe Power Log Silk Screened On Pre filter Protects Against Large