For Use With LS Series Or 6.2L Chevrolet Vortec Engines; Long Tube Chassis Exit; 1-7/8 Inch Diameter Primary Tubes; 3 Inch Diameter Collector; 3/8 Inch Thick Head Flange With Round Ports; 49 State Legal/ Off Road High-Way Use Only; Ceramic Coated Silver Mild Steel; With Bolts/ Gaskets