exhaust system is more than a muffler. It is a series of pipes that run
under your car, connected to your muffler and catalytic converter. The
main function of your exhaust system is to control noise and to funnel
exhaust fumes away from passengers.
In some ways, a car's exhaust system works like a chimney on your house,
directing the by products from burning fuel away from the people inside.
A car's exhaust system routes waste gases from the engine to the rear of
the car, where they are discharged into the atmosphere. Exhaust gases
contain dangerous substances such as carbon monoxide, which can be
hazardous if allowed to flow into the passenger housing of the car.
The exhaust system also converts pollutants into less harmful by
products, reduces the noise of the engine, and directs exhaust gases so
they can be used to heat air and fuel before they go into the engine's
cylinders to be burned. Finally, the exhaust system provides just the
right amount of backpressure into the engine to improve its fuel-burning
efficiency and increase performance.