Update your semi truck with reduced noise output, with the Power Products 8-1/2" x 34-3/8" Standard Type 1 Muffler that ensures you're Ready for the Road Ahead. 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.