Ensure your semi truck is Ready for the Road Ahead with reduced noise output, with the Power Products 9" x 44-1/2" Standard Type 1 Muffler. To dampen the sounds produced by exhaust gases as they exit the pipes of a vehicle, this replacement component is crafted with an advanced design that cancels out specific frequencies. Fashioned with special components to enhance flow control and backpressure regulation. FleetPride is your First Click in Heavy Duty .