1. Isolate the intake system and exhaust system of Bare Engine: The inside of the intake manifold is equipped with a rubber tube, which can effectively isolate the intake system and exhaust system of Bare Engine, prevent heat exchange between them, and thus improve the efficiency of Bare Engine.

2. Reduce the vibration and noise of Bare Engine: The inside of the intake manifold is equipped with a silencer, such as a silencer ring, a muffler, etc., which can effectively reduce the vibration and noise of Bare Engine, thereby improving the working efficiency of Bare Engine.

3. Reduce Ford Mazda Engine emissions: The intake manifold can effectively control the emissions of Bare Engine, thereby reducing the emission of pollutants and improving air quality.

In summary, the function of the intake manifold is to isolate the intake system and exhaust system of Bare Engine, reduce the vibration and noise of Bare Engine, reduce the emissions of Bare Engine, and thus improve the efficiency of Bare Engine. Therefore, regular inspection of the intake manifold and timely repair or replacement can effectively protect the normal operation of Bare Engine.