Prevent sand, mud, and dirt from damaging the air filter in your 2003-2010 Chevy/GMC Kodiak/TopKick 6.6L Duramax with a Pre-Filter. Pre-filters from AFE, K&N Engineering, Banks, and others are all available at XDP. Finding the right pre-filter for your intake can be done by matching up filter dimensions or by using the corresponding filter part number. Pre-filters feature a breathable construction with a free-flowing material that allow your filter to breathe while blocking out 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.