Equip your semi truck to be Ready for the Road Ahead™, with the Power Products 9" x 44-1/2" Standard Type 1 Muffler, a key piece that reduces noise output. Due to its advanced design that cancels out specific frequencies, this replacement component is able to dampen the sounds produced by exhaust gases as they exit the pipes of a vehicle. Constructed with special components to enhance flow control and backpressure regulation. FleetPride is your First Click in Heavy Duty®.