I think that the stock surge valve might not work like most BOV do. This is the first time I have seen a BOV that actually has a solenoid to control it.
For those who dont know how a regular BOV works, this is how:
YOu have two chambers, one that sees what ever the turbo is putting out, and another that sees the pressure/vacuum in the manifold. WHen you are boosting, there is pressure on both chambers. YOu have pressure from the small vacuum hose acting on the valve to stay closed as well as the spring. Now when you get off the gas and the throttle closes, there is not a differential pressure in the BOV. So now you hav a vacuum on one side of the valve and pressure on the other side which causes it to open. THis is how all bov work.
Now, I think the stock surge valve on our car works the opposite way. I think when it sees pressure on one end, it cause the valve to open. I have to check it out when I have time. I just dont see why you would need a solenoid on. The only reason I can see is as a saftey feature if you over boost, it causes the surge valve to open and recirc.