Actually, one thing that open scoops (without Ram Air) will do is cool down the engine when it's parked. Hot air rises, and that hot air will go out through the twin nostrils.
True Ram Air (scoops sealed to the carb) will lower the incoming air temp to the carb. Cold air is more dense than hot air, and the denser that air is, the more power you will make. With the correct jetting, you can pick up 10-30 hp, depending on the setup.
