18 what is the name of the connecting pipe of Jetta throttle?

The function of exhaust pipe is to extract engine exhaust gas under certain working conditions.

Part of the exhaust gas discharged by the engine is sent back to the intake manifold, and enters the cylinder again together with the fresh mixed gas to participate in combustion and do work.

Because the exhaust gas can't burn, the combustion speed and temperature in the cylinder are reduced, thus improving the emission and reducing the pollutant content.

Not connecting the automobile exhaust pipe has no effect on the engine, but it has an impact on the environment.

Some unburned gases will be directly discharged into the atmosphere, the exhaust pipe of the car is not connected, and the engine may be noisy.