Outfit your semi truck to be Ready for the Road Ahead with a smooth expulsion of gases, with the Power Products 4" x 18" Aluminized Curved Exhaust Stack Pipe. With a vertical design, this replacement stack works to transport exhaust gases away from an engine and into the atmosphere where it is quickly dispersed. Manufactured with a durable metallic body to be suitable for outputs from diesel engines. FleetPride is your First Click in Heavy Duty .