2011 - 14 Mustang GT headers with 1 - 78 primary tubes, 3 X - Pipe, 3 dia lead pipes and high flow catalytic converters that mate to the Stainless Works exhaust. Tig welded 304 SS headers with 38 thick flanges and 3 dia slip fit collectors with merge spikes. This system connects to SW Performance Connect exhausts for a full 3 diameter superior performing lifetime guaranteed bolt - on system.