Well just to clear things up, and it does seem that you guys have your wires crossed. But we actually have another exact same car thats unmodified and working as subaru intended it too.
We have mapped exactly what everything is doing, when boost/vacuum is being sent to various actuators etc. And guess what, the working car is boosting 15psi on the primary. So before you go strangling me with the no8 wire i suggest you go and do some homework 1st.
Remember this is a 2002 tt legacy, they differ slightly from the earlier ones. The early ones boosted around 10psi on the primary and around 15psi on the secondary.
If you knew how much time we have spent on this trying to figure it out then you might have a better understanding. And the fact that its my bosses car must also have some credit.
So we still have the problem of only 5psi of boost on the secondary. Forget about the primary, I'm happy with that, as its working like all the other cars we've compared it too of that model year.