Prevent sand, mud, and dirt from damaging the air filter in your 2005-2006 Jeep Liberty 2.8L CRD 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. Find the right pre-filter for your intake system by matching up your filter part number, or by using the filter dimensions. Pre-filters are manufactured from a breathable material that lets air through while blocking large debris and 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.