JDC Titanium Exhaust Manifold Stud Kit | Mitsubishi Evo XJDC Titanium Exhaust Manifold Stud Kit (Evo X) Using the factory exhaust manifold bolts and studs with an aftermarket turbo can result in stripped or broken bolts and inadequate sealing force, which will result in an exhaust leak. This kit will allow you to properly seal the exhaust manifold to the cylinder head and will never rust or corrode! The JDC titanium stud kit is made from Ti6Al 4V (Grade 5) titanium and incorporates a hex key tip that allows