Product Details: 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®.