Upgrade the air filter in your 2017-2019 Chevy/GMC 6.6L L5P Duramax with a new Drop-In Air Filter. Drop-in air filters are aptly named as they have a "drop-in" installation that allows them to fit inside of your factory air box. Direct-replacement drop-in filters are manufactured with a paper filter media, and aftermarket filters are made with an oiled cotton-gauze, or synthetic dry filter media. An air filter is a crucial component for your engine and its purpose is to keep harmful airborne dust and debris out of your engine. Shop for drop-in air-filters from manufacturers like S&B Filters, AFE, K&N Engineering, and others available at XDP.