For Ford Mustang Pony SN95 3.8 V6 Stainless Steel Long-Tube Header Manifold/Exhaust High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability. i.e. Maximizing Smoothest High Exhaust Air Flow Rate 3-1 High Performance Long Tube 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; 10mm Thick Header Flange Inlet/Outlet: 1.625"(OD)/2.625"(OD) / Slip on Collector, Requires Use of Aftermarket Y-pipe / 16 Gauge Wall Piping / EGR Flange, O2 Bungs and Metal Gaskets Included