"standing boost"????? Options

[teamchancery]

now i was passing through a garage and heard part of a discussion and i am wondering if anyone can shed some light.
It seems as if there was a 3sgte engine top mount IC now they have moved it to FMIC .So now the car is parked and they rev it and see that boost hits 10 psi now i heard someone say that standing psi(not sure if is actual term or is him way of expressing it) should be around 4 to 5 pound when u rev it so probably when the person goes on the road to drive instaed of the factory boost(10 psi) he could hit all 18 psi
Now the part of the explanation i heard is that because the actuator was moved from where it was and something about their being more tension that that is the reason that boost was increased over stock
(1) Could someone explain to me why when a car is parked and revved that it should only show x( 4-5 i heard them say) boost and why is this so
(2) explain to me moving actuator and creating tension is causing the car to rev over the factory boost settings