Pre-Filters help to prevent sand, mud, and dirt, from contaminating the air filter in your 2008-2010 Ford 6.4L Powerstroke. XDP carries pre-filters from manufacturers such as AFE, K&N Engineering, and many more! You can get the right pre-filter for your intake by matching up the filter dimensions or from the corresponding filter part number. Pre-filters feature a breathable construction with a free-flowing material that lets air through while blocking larger contaminants. A pre-filter provides your vehicles engine, air intake system, and air filter with the protection it needs from large airborne contaminants while also helping to extend cleaning intervals.