Chevy & GMC Truck & SUV Shorty Headers 1999-2006 (6.0L Engines) Stainless Mandrel Bent Tubing, CNC Machined Flanges EGR Fitting, 304 Polished Stainless Steel 1 5/8" Primaries/2 1/2" Collector, Standard Graphite Manifold Gaskets 1999-2006 (2wd & 4wd) Gains over 15rwhp