These high-polished, steel, chrome-finished, Concours exhaust tips are sold as a pair for the driver and passenger side. The pipes are 11-inches long with a 4-inch exit opening. This Pair of Concours exhaust tips are an exact reproduction of the 1970 Mach 1 Mustang's exhaust tip design, including the Concours rolled tip like the original OEM version. They improve the flow and help eliminate backpressure. The pair are easily installed on existing exhaust systems with pipes up to 2-1/4-inches.