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It should be understood that the automation of technological processes is a set of different methods and means aimed at implementing the technological process without the direct involvement of the person, or leaving him the right to make key decisions.

The exhaust gas in the exhaust pipe will form a small back pressure, if the back pressure is too large exhaust can not proceed smoothly, indirectly leading to the engine piston needs to consume more energy to launch, increase the power consumption of the engine, and even affect combustion, so in order to timely reduce the back pressure of the exhaust system, Make the exhaust more smooth, let the car "into more, exhaust faster", the design of the exhaust port is very important, which is why there will be double or even four exhaust ports.