ram air DOES NOT work at the speeds you can achieve on a rd car.
You will not be able to create any positive pressure on a rd car induction system. The only rd car that can feasably make even near 1psi of positive pressure is the Mclaren F1, and even at its top speed you looking at power it cant use.
No point and anybody that tells you it works, ask them to prove it theoretically and practically.
saying "it feels faster" jsut doesnt work, the majority of any power gains comes from a much cooler inlet temp.