Black Coated Performance Exhaust Header System Kit 97-99 For Jeep Wrangler TJ 2.5L 4-Cylinder Fits: 1997-1999 Jeep Wrangler (TJ) 2.5L 4-Cylinder 16-Gauge Mild Steel & Black Coated For Durability Tube Diameter: 1-1/2". Collector Diameter: 2-1/2" Gasket & Hardware Included TIG Weld & Mandrel-Bent For Maximum Performance