2003 - 06 ChevyGMC 6.0L (4WD only) Truck. CNC Mandrel Bent 304 stainless steel construction, 1 - 34 primaries, 38 thick CNC Laser cut flanges, 2 12 catted leads. Designed to connect to factory exhaust. Stainless Works headers are backed by a limited lifetime guarantee on material and workmanship and are made in the USA.