For Dodge Ram/Dakota/Durango 3.9L V6 Stainless Steel Header Manifold/Exhaust Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durabilityi.e. Maximizing Smoothest High Exhaust Air Flow Rate 3-1 High Performance JDM Racing Spec. Design, Produces the Most Top End Power Offers the Best Flow Characteristics for the Engine at High Engine Speeds; Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq. TIG Welded CNC Machine Flange; Ball Socket Flange Inlet/Outlet: 1.5"(OD)/ 2"(OD) / 16 Gauge Wall Piping / EGR Flange and Metal Gasket Included