Kooks - 114224002011-2014 Ford Shelby GT500 5.4L/5.8L 4V 1-7/8in. x 3in. Stainless Steel Headersw/1pr 12in. O2 Extension Harness.Kooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50 Years! Since 1962, Kooks...