For Use With Chevy 4.8L/5.3L/6.0L LS Series Engines; Chassis Exit; 1-7/8 Inch Diameter Long Style Primary Tubes; 3 Inch Diameter Slip On Race Style Collectors; 3/8 Inch Thick Head Flange With Round Ports; Natural Silver Mild Steel; One pair of headers/mounting hardware/O2 Bungs/gaskets/Instructions