Extra kick with less weight, saves up to 9 lb of dead weight. Unique first in the industry; Dual Stage acoustical design. Pull up to five more horsepower from the sled's motor, depending on the application. Rumble Pack Silencer Kits attach to stock exhaust pipes and include complete instructions. No modifications to belly pan required for installation. Single canister design with polished stainless steel for a long-lasting finish.