For Ford/Mercury I6 6-2-1 Design Stainless Steel Exhaust Header Kit (Polished Chrome) 144/170/200/240/250 CID Made of High Quality T304 Stainless Steel for Strength & Durability TIG Welded CNC Machine Flange for Percision & Fitment Offers the Best Flow Characteristics for the Engine at High Engine Speeds Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq. 1.32" x 1.6" Oval Inlet / 1.85" Outlet / Gasket Included