Platinum Racing Products - Pro Series Exhaust Manifold Stud KitPlatinum Racing Products billet titanium exhaust manifold fasteners are a new addition to our Extensive range made of T5 grade titanium and CNC machined in Australia. All threads are rolled and Guarantee ultimate quality, you will also notice an internal Hex and external Hex for ease of use in any exhaust manifold turbo type application. *Kit no longer includes washers due to update in the design for the nut.