Polished Stainless Steel Long Tube Exhaust Headers & Y-Pipe Kit 99-05 Chevy/GMC Silverado Sierra 1500 Truck 4.8L 5.3L V8 Fit: 1999-2005 Chevy/GMC Silverado/Sierra 1500 Pickup Truck, 4.8L & 5.3L V8 Long Tube Headers With Extension Pipes & Resonators Included Inlet Diameter: 1.875". Outlet Diameter: 2.50". Flange Connection Gasket(s), Bolt(s) Are Included As Pictured TIG Weld & Mandrel-Bent For Maximum Performance