Front pipe bolt. Left.5.4 LITER. Right.5.4 LITER. An exhaust Bolt is a specialized fastener designed to secure various components of an exhaust system, including the manifold, catalytic converter, and exhaust pipes. Catalytic Converter Bolt. Exhaust System Hanger Bolt. Catalytic cnvrtr. Catalytic Converter. Exhaust System Hanger. Insulator. Mount screw. Pipe. Support.