Banks Power Pre-Filter (for PN 42138)Highly recommended in dirty environments. Keep your Ram Air Filter protected from large debris, bugs, mud, etc Built from a breathable material, the Banks Pre Filter goes over your air filter, provides additional protection, and can even extend cleaning intervals. Works with both Dry and Oiled filters. Banks pre filter wraps are designed to work with your Ram Air intake system and are constructed from a polyester mesh with uniform micron openings. It