The 4.8/5.3 header package is available and the one for the 6.0 trucks should be ready to ship in a few weeks. We are currently taking orders for this package and will ship as soon as they arrive. You can also order the headers by themselves and cut/weld them to your stock Y-pipe.
115-841300 - 2000-'03 5.3 Truck / SUV - 1500 series 2WD & 4WD pickups, Avalanche, Suburban, Tahoe and Yukon
115-841350 - 2000-'03 6.0 2500 series 2WD & 4WD pickups and Suburbans, Escalade, Denali and H2
115-841310 - 2000-'03 4.8, 5.3 and 6.0 Chevy/GMC 1500 SUV*
(*Avalanche, Escalade, Suburban, Silverado, H2, Tahoe, Yukon and Denali)
This package is for the headers only with 2 1/2" collectors. Reducer cones have 02 sensor bungs installed. You will need to cut/weld these to your stock Y-pipe.
115-841300
SuperMaxx Stainless header System
$1294.99
115-841350
2000-'03 6.0 GM Truck / SUV SuperMaxx Stainless header System
$1294.99
115-841310
2000-'03 4.8, 5.3 6.0 GM Truck / SUV headers only (won't fit 2500 series)
$974.99
Tom