Exhaust system is an important component of the vehicle. When fuel burns there are appear exhaust gases, which are removed through the exhaust system. The exhaust system ensures emission of bad-smelling gases. One more important function of the exhaust system is sound insulation. In the engine combustion chambers there are small explosions necessary for fuel combustion, which are relatively loud. Due to the exhaust noise is greatly reduced. For many years now catalysts provide filtration and release of most pollutants from the exhaust gases.

In order the engine to work at a full capacity, it must be well aligned with the exhaust system. The optimum exhaust emission is possible only if the fluctuations that occur in the exhaust system promote and not prevent the process of emission. Torque is also determined by the exhaust. Thus, a faulty exhaust leads to reduction of the engine power.