The exhaust system in a vehicle runs from the engine to the exhaust pipe, allowing the harmful gases from the combustion process to bypass the cabin of the car, where it could be potentially harmful. The exhaust system also quiets excess noise from the engine and acts as a filtering agent to protect the environment. The exhaust manifold, the oxygen sensor, the muffler, exhaust pipes, and the catalytic converter make up the exhaust system as a whole. This system must be properly regulated in order to ensure the safety of the driver and passengers as well as the environment and the efficiency of the vehicle.