You must tune for this hardware! Using stock or off-the-shelf EM with a 3-port solenoid installed in interrupt mode will result in overboosting! The benefits of this upgrade are faster spool, ability to hold higher boost, and better control over boost.
How do you test a boost solenoid?
https://www.youtube.com/watch?v=qvpjhN-2DdI
Where does the boost control solenoid go?
In effect, a boost-control solenoid valve lies to the wastegate under the engine control unit´s (ECU) control. The boost control solenoid contains a needle valve that can open and close very quickly.