Magnaflow's Street Series exhaust for V8 2005-2009 Mustang's will free up horsepower and torque not to mention give you a great sound! The Magnaflow exhaust is 100% stainless steel construction and feature 2.5" mandrel bent tubing and 4" polished stainless tips. This kit is a direct bolt on for 05-09 Mustang 4.6L & 5.4L including the GT and Shelby GT500