The Stainless Works long-tube headers for 2011–2014 Ford F-150 5.0L (2WD/4WD Screw/Scab trucks) are USA-made from 304L stainless steel. They use 1-7/8" primaries, 3" slip-fit collectors and 3" catted lead pipes with an internal X-pipe and resonator to connect to Stainless Works performance exhausts, providing a direct-fit header solution for higher-flow exhaust systems.
Stainless Works 2011-14 F-150 5.0L 1-7/8in Primaries 3in High-Flow Cats X-Pipe