Product Details: Outfit your semi truck to be Ready for the Road Ahead™ with reduced noise output, with the Power Products 9" x 20" Short Type 1 Muffler. Thanks to its advanced design that cancels out specific frequencies, this replacement component works to dampen the sounds produced by exhaust gases as they exit the pipes of a vehicle. Crafted with special components to enhance flow control and backpressure regulation. FleetPride is your First Click in Heavy Duty®.