Performance Exhaust Header Kit System For 91-95 Jeep Wrangler YJ 2.5L 4-Cylinder Fits: 1991-1995 Jeep Wrangler (YJ) 2.5L 150Ci 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