2.4 LITER. Isolator bolt. An exhaust Bolt is a specialized fastener designed to secure various components of an exhaust system, including the manifold, catalytic converter, and exhaust pipes. Automatic Transmission Mount Bolt. Exhaust System Hanger Bolt. Automatic Transmission Mount. Exhaust System Hanger. Hex Flange Head. Isolator. Resonator w/pipe. Screw.