Front pipe bolt. Left.3.0 LITER. Right.3.0 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. Exhaust Muffler Bolt. Exhaust System Hanger Bolt. Ignition Knock (Detonation) Sensor Bolt. Bushing. Center. Exhaust System Hanger. HexAGON - Head. Ignition Knock (Detonation) Sensor. Muffler AND pipe. Plate. Screw.