Big Gun EXO Exhaust Packing Kits Proper exhaust maintenance is crucial, extend the life of you Big Gun's packing-style mufflers with a Big Gun Packing Kit. Features: Compatible with all EXO and EXO Stainless mufflers High temperature loose-fill packing material condensed into an outer casing Rated at approximately 20-25 hours of ride time Maintains noise levels without affecting power Keeps overall muffler heat down