Heat shield screw. Left.3.5 LITER. Right.3.5 LITER. A Screw that is used to secure the Exhaust Manifold Heat Shield to its mounting point. A Screw used to secure the catalytic Converter Heat Shield to its mounting surface. Exhaust Manifold Heat Shield Bolt. Hardware to attach the Heat Shield to the catalytic Converter. and Washer Assembly. Catalytic. Exhaust Manifold.