Computerized PrecisionHighest Quality MaterialsDurable And AffordablePAINTED HEDDER, EXHAUST HEADER -- Tube Size 1.625" - 2", Collector Size 3", Without Smog Injection Or Injection Heads, 3 Tube Design, Modification To Stock Exhaust Required To Retain Catalytic Converter, Some Heads Require Drilling And Tapping Of End Holes, Includes Parts Necessary To Retain Emission Devices (50 States), Except Round Ports, Without A.I.R. Systems, If Emission Controls Are Not Removed Considered OEM Replacement