Pre-Filters help to prevent sand, mud, and dirt, from contaminating the air filter in your 2003-2004 Dodge 5.9L Cummins. XDP carries pre-filters from manufacturers such as AFE, K&N Engineering, and many more! Pre-filters are manufactured from a breathable material that lets air through while blocking large debris and contaminants. A pre-filter installs tightly over your air filter and serves as the first line of defense to keep larger debris out of your filter media and help extend cleaning intervals. You can get the right pre-filter for your intake by matching up the filter dimensions or from the corresponding filter part number.