While the specifications of your engine and exhaust system may vary, there are certain requirements that every system should follow: What are the Main Constraints of Inboard Exhausts? They do run cooler but also require a lift muffler and protection against damage from leaks. Below Water: Below water installations are quieter, but you don't have the same ability to look over the transom to see exactly what's happening.Above Water: As the name suggests, in this case the entire exhaust system operates above the waterline it's easy to see what's going on but it can be noisy and they often run hotter than below water installations.There are two basic approaches to follow to achieve these goals: Most boats feature a wet exhaust system, where water injects into the exhaust to moderate the temperature and noise levels. What are the Basic Types of Exhaust Systems?Īll marine exhausts do two things, by their very design: remove exhaust gasses and keep water out. A simple boat exhaust blower can help clear away potential leaks, but you need something that can both get the exhaust out of the boat and make sure the water doesn't flow back into the engine. Every inboard engine needs a way to get the exhaust out of the engine compartment. Marine outboard exhaust systems get the exhaust out of the boat so you don't have to breathe it. In the world of marine performance, you cannot underestimate the importance of inboard exhaust systems.