As of date, automobiles that use fossil fuels like petrol, diesel or gasoline, invariably have an exhaust system built in them. This system consists of hardware such as flanges, clamps, connecting pipes, extension pipes, tail pipes, resonators, mufflers, mangers, resonance chambers, perforated pipes, exhaust pipes, air injecting tubes, Oxygen sensors, and catalytic converter. These hardware components collectively formed the exhaust system and used to let the exhaust gases escape from the automobile's engine. Basically, the system is mainly a set of pipes or ducts. These pipes effectively steer exhaust gases away from the automobile's combustion unit as well as automobile user. If left within combustion chamber, they can bring down the fuel's efficiency due to additional pressure. Exhaust gases often contain toxic compounds that are formed because of fossil fuel combustion.
Such exhaust systems are also present in other motorized vehicles such as motorbikes. These systems of different automobiles and motorized machines may have varying components. In some systems, exhaust gases are passed through a catalytic converter. This converter brings down the pollutants by converting some of the toxic byproducts in exhaust gases into non-polluting substances. Such converting system is generally found in engines with internal combustion system but may also be used in other exhaust systems. Some of the exhaust systems may entail sending these gases through what is known as a silencer, or muffler. This process reduces any noise pollution from exhaust systems. Different countries and continents have different set of rules and regulations relating to noise and air pollutions. Therefore, the simple function of traditional exhaust systems has been increased to include new functions, i.e., reduce noise as well as harmful gases being released in the atmosphere. Effectiveness of exhaust systems in pollution control is one of the important factors while considering purchasing any vehicle.
Exhaust gases from different parts of the engine are at times collected by different pipes, and all such gases may be eventually be collected and passed through single pipes, exhaust manifolds or cylinder heads. In some other automobile engine designs, exhaust gases may also be used in turbochargers to increase the engine's power.