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. Includes 3" dia. lead pipes with high flow metal matrix catalytic converters and X-pipe. These Performance Connect headers are for use with Stainless Works exhaust.