Porsche Boxster 97-04 986 Exhaust Headers Manifolds Stainless Steel inc gaskets Two Exhaust Headers/Manifolds with Gaskets and bolts. Features Dual O2 Sensors and comes with blanking plugs for models that dont require them. Fits both the Base and S model Boxster 986's. CNC machine flanges with TIG and MIG welded construction. Although DIY is possible. PROFESSIONAL INSTALLATION is RECOMMENDED, NO instruction will be included except the manufacturer's original ones if there is any.