Psi to psi doesn't even matter than much. Trd at 8psi compared to urd at 8psi, the urd puts more cfm of air down the intake than than the trd. Still both are at 8psi the urd still makes more power cause more air flow not psi.
I think I have a knowledge gap here. I thought manifold pressure and air flow are alternative methods to measure engine load, and the two are direclty proportionate. So the more the pressure the more the air flow, and vice versa. Why would air flow deviate from pressure?