For Use With Chevy 4.8L/5.3L/6.0L LS Series Engines; Chassis Exit; 1-3/4 Inch Diameter Mid-Length Style Primary Tubes; 3 Inch Diameter Ball & Socket Style Collector; 3/8 Inch Thick Head Flange With Round Ports; Black Maxx Ceramic Coated Mild Steel; One pair of headers/mounting hardware/O2 Bungs/gaskets/Instructions