Your exhaust is made up of 3 main parts,the exhaust manifold,catalytic converter, and the muffler. Each of the three parts has a crucial role to play,the exhaust manifolds job is to redirect harmful gases away from the cabin compartment of the vehicle. The Catalytic converter is one of the most important parts of a car, reason being it filters most of the harmful gasses that all cars emit, such as carbon monoxide, and nitrogen oxide. When the catalytic converter is not functioning properly your check engine light may come on. Last but not least the muffler, the muffler simply reduces the amount of noise allowed to escape the exhaust system, and is usually located at the end of the system towards the rear of the vehicle.