Prevent sand, mud, and dirt from damaging the air filter in your 2017-2024 Ford 6.7L Powerstroke with a Pre-Filter. Shop from brands like AFE, K&N Engineering, S&B, Banks, and others at XDP and find the perfect pre-filter for your air filter. 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. Pre-filters are manufactured from a breathable material that lets air through while blocking large debris and contaminants. Finding the right pre-filter for your intake can be done by matching up filter dimensions or by using the corresponding filter part number.