aFe Vulcan Series 3 1/2in 304 SS Cat-Back 13-19 Ford Transit V6 3.5 Twin Turbo w/ Polished Tip3 1 2" 304 Stainless Steel Tubing: This system is constructed of durable mandrel bent 3 1 2" 304 stainless steel tubing for maximum corrosion resistance. Mandrel bent tubing for maximum air flow and low turbulence; increasing torque, horsepower and improved throttle response. This exhaust system is designed to fit models equipped with factory single side exit exhaust. Rear Side Exit Exhaust with 4 1 2" x 12"L Polished 304 Stainless Steel Exhaust Tip