BBK 4011 High Performance True Dual Exhaust Conversion With X-Pipe And High Flow Catalytic Converters for Ford Mustang 4.0L, V6 - Chrome Finish 2005-09 Mustang V6 2.5" Tubing Manual or Automatic Transmission With High-Flow Converters Note: When used with the existing passenger side exhaust pipe it converts any V6 to a true dual system that allows the use of any GT dual axle back kit.(not included)Includes: Full-Length 2.5" Mandrel-Bent Aluminized Steel X-Pipe