DNA Motoring HDBMP01 Stainless Steel Exhaust Header Manifold [For 01-03 Mazda Protege 5 2.0L DOHC] Precision machined steel flanges that provide a tight seal at the head and allows a high flow rate through the primary tubes Made From High Quality T304 Stainless Steel For Strength & Durability Constructed With TIG Welded CNC Machine Flange For Percision & Fitment All Tubing Is Mandrel-Bent Comes With O2 Sensor Bung Insertion & Metal Gasket