The exhaust system is the only process a car has for safely removing dangerous and poisonous gasses from your vehicle. A problem with your exhaust as a whole or any part of it could lead to the poisonous gasses entering your vehicle and being inhaled by passengers.
An important area of maintaining a vehicle and the driver's and passenger's safety is to ensure the exhaust system is regularly checked and well maintained.
Catalytic converters are an effective way to deal with car exhaust fumes in an environmental friendly manner. They cut down pollution & remove many of the harmful gasses created by your vehicles engine.