What is the function of the exhaust header?

[BeckettAnn]

The function of the exhaust header is to detect the air-fuel ratio and reduce the pollution level of exhaust gases when they exit the engine, achieving environmental protection effects. The exhaust header generally refers to the part directly connected to the engine's exhaust, mainly consisting of three parts: metal connecting pipes, flexible connections, and a metal high-flow catalytic converter. For exhaust modifications, modifying the exhaust header has a greater effect than modifying only the mid and rear sections, especially when using a piggyback computer or ECU modifications. To maximize power enhancement, the exhaust header must be replaced. Additionally, header modifications also provide some benefits for the turbocharger.