Prevent sand, mud, and dirt from damaging the air filter in your 1982-2000 Chevy/GMC 6.2L/6.5L Diesel with a Pre-Filter. Pre-Filters are installed over top of your air filter and serve as another layer of protection from airborne contaminates that could otherwise damage your filter, air intake, or engine. 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. 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.