Some cars are used to connect water pipes to the throttle body?

This is a bypass air control system with a paraffin valve inside. Paraffin wax is heated by cooling water, and the bypass air channel is controlled by using the characteristics of paraffin wax that expands with heat and contracts with cold. The main function is to improve the air intake when the refrigerator is idling quickly.

That water pipe should not be a cold water injection system. Cold water injection system is generally used in high-pressure engines, that is, racing cars are used more, and this system needs high pressure and nozzles.

If there is only a water pipe, it is a bypass ventilation control system, and there should be two pipes, one in and one out.