Ok, let me try this again lol.. The air is going to follow the path of least resistance from high pressure to low pressure we are on the same page with that. The air being pushed into the intake tube is going to fill the intake because the pressure is lower, as the engine is expelling pressure and drawing vacuum we can agree on that. When the air is stuffed in the tube at a pressure of 14.6 psia, the pressure of the air and the pressure in the tube are equal, and the air will begin to travel around the pipe because the pipe is full because it is easier for the air to do that than to compress all of the air in front of it. Ram air is more a matter of ideal location and constant intake tube filling.. not over-pressurization of the tube. The higher velocites will fill the tube quicker, getting the air to the chamber quicker.. more efficiently. When an engine is at high rpm, it needs a constant supply of air at a high velocity.. an intake inside the engine bay would just rob horsepower, rather than a ram air setup "making" power due to a forced induction effect.