The intake manifold is a section of conduit connecting the cylinder and the air filter. Its function is to introduce air into the Bare Engine and provide sufficient oxygen for the combustion of the Bare Engine.

The intake manifold mainly consists of two parts, one is the air intake port and the other is the bifurcated conduit. The air intake port is mainly responsible for introducing air, and the bifurcated conduit distributes the air to each cylinder.

Common materials for the intake manifold include aluminum alloy, plastic and cast iron. The intake manifold made of aluminum alloy is relatively light, has good corrosion resistance and high temperature resistance, and is suitable for high-performance models.

The intake manifold made of plastic is low in cost, but is easily affected by temperature and pressure and is not suitable for long-term high-load work. The intake manifold made of cast iron is heavy, but has good durability and small dimensional changes.

The maintenance of the intake manifold mainly involves cleaning and replacement. Because the intake manifold will accumulate a certain degree of oil stains and dirt, the air intake port will be blocked, affecting the normal operation of the Bare Engine. Therefore, it is necessary to clean the intake manifold regularly every year. In addition, if the intake manifold has cracks or leaks, it needs to be replaced in time.

The modification and optimization of the intake manifold can make the Toyota Engine air intake smoother and improve the performance and fuel consumption of the Toyota Engine. The modification can be carried out by replacing a new intake manifold or installing a cold air port. In terms of optimization, the efficiency of the intake manifold can be improved by replacing the air filter and adjusting the air flow sensor.