Stainless Works 2014-16 Chevy SS 6.2L Headers 1-7/8in Primaries 3in X-Pipe High-Flow Cats Factory2014 17 Chevy SS 6. 2L Headers. All tubes are CNC mandrel bent for optimal flow. Made from 304 stainless steel for maximum corrosion resistance. Starting with a CNC cut 3 8" thick flanges into 1 7 8" primaries, 3 slip fit collectors and catted leads with a 3" X pipe to factory connection point. Headers are fully TIG welded and back purged. These are TIG welded for strength and durability. These kits come with a lifetime warranty and proudly made in