Geez Louise, ram air and fe?
THINK about it: for ANY desired power setting and rpm the operator regulates that with the throttle. Say you had 20 psi ahead of the throttle- the operator would simply close the throttle more and the action behind the throttle plate would be THE SAME. Yes, the intake tract, valves, pistons, exhaust... all subject to the SAME vacuum and "work" at less than WOT.
Autospeed claims a bit of improved tip-in throttle response and not a whole lot else. Good on them, that seems sensible.