Stainless Works 2006-09 Trailblazer SS 6.0L Headers 1-3/4in Primaries 2-1/2in High-Flow Cats2006 09 Chevy 6. 0L Trailblazer SS 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 3 4" primaries and 2 1 2" slip fit collectors. Features Y pipe and catted leads to fit 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