Big Gun Dura-Pak Packing Kit (17in) Are you looking to do more riding and less worrying about maintenance? Well, Big Gun's Dura-Pak kit might just be the ticket. For just shy of double the price of the Standard Packing, you get more than three times the life with this kit. Since all Big Gun mufflers are packing-style mufflers that contain packing material within them, they eventually require maintenance. Why not prolong your packing intervals with the Dura-Pak?15" or 17" packing pillow for easier installation.High-temp loose-fill packing material condensed into an outer casing (resembling a pillow).15" or 17" steel wool style specialty screen for added lo Use Loctite on ALL screws when installing and periodically check to ensure they are tight.