Pro Series exhaust systems deliver the deep, rich sounds you want, as well as the performance gains you demand. This T409 stainless steel Pro Series Axle-back system for the 2013 to 2014 Mustang GT features Laminar Flow Pro Series mufflers with polished 4.00 in. stainless tips and is a direct bolt on for the restyled Mustang. A lifetime limited warranty provides assurance that this American made exhaust will deliver that famous Flowmaster sound for many years to come.