Pypes Exhaust XFM23 2005-2010 Mustang GT Stainless Steel X-Pipe New Pypes x-pipe kit XFM23 Fits 2005-2010 Ford Mustang GTs T-409 stainless steel; Includes two-piece x-pipe kit with clamps and hangers 10-15 horsepower gain while improving mid-high torque Lifetime warranty as long as it's installed