Your exhaust system is effectively a series of pipes and boxes specially designed to channel emissions away from the front of the vehicle, reduce engine noise and maintain optimum fuel efficiency.
All exhausts produce six gases as emissions; of the six, three are toxic (carbon monoxide, nitrogen oxide and nitrogen monoxide). Your exhaust emissions system is the only means of channeling away those noxious fumes. An exhaust that has failed can lead to these fumes being drawn into the vehicle cabin and prolonged exposure to exhaust fumes can make a vehicle occupant feel drowsy, which could lead to an even greater danger, so it’s important to maintain a healthy exhaust system.
Under existing regulations a police officer can warrant the removal of any vehicle from the roadways on the suspicion that it is producing excessive amounts of pollutant gases from the exhaust. Also, if your vehicle exhaust system is broken and noisy your vehicle will come under police scrutiny. Your vehicle will also fail its MOT test if the exhaust system has a fault resulting in incorrect emissions levels being recorded.