DNA Motoring HDS-DR92V6-39L Stainless Steel Exhaust Header Manifold Made of 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 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