Kooks - 114235003in. x 2-3/4in.(OEM) SS Catted H-Pipe. 2011-2014 Shelby GT500.3in. x 2-3/4in.(OEM) Catted Stainless H-Pipe. Must be used with Kooks Headers.Kooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50...