2011-2013 Shelby GT500 1 7/8" headers and lead pipes. Tig welded 304 s/s headers with 3/8" thick flanges and smooth flow collectors. Oval exhaust ports that are an exact match to the factory cylinder head. 3" OD slip joint collectors with merge spikes.Your choice Off-Road Pipes or Catted Leads, X-pipe or H-pipe. Connect the the factory location, or choose performance connect to fit to an SW exhaust for more power.