MARINE Engine Exhaust Manifolds, Risers, Spacers, Heat Exc, HUGE RANGE New, Used

The exhaust system of a marine engine is a complex assembly designed to safely discharge combustion gases while preventing the ingress of water into the engine cylinders. The primary components—exhaust manifolds, risers, and spacers—must operate in a harsh environment where high-temperature gases meet cooling water. The manifold collects exhaust gases from the cylinder head ports, while the riser serves as the transition point where cooling water is injected into the exhaust stream, effectively cooling the gases and the downstream exhaust hoses.