PaceSetter 70-2276 Long Tube Header for 5.3L, 6.0L Chevy Trailblazer/GMC Envoy 2006-09 CNC-machined, port-matched thick steel flanges provide postive seal at the head and unrestriced flow into the primary tubes All tubing is mandrel-bent, 16-gauge carbon steel for excellent durability Available with standard black paint finish or optional Armor Coat metallic ceramic coating Unsurpassed fit and easy to install with basic skills Gaskets and hardware included