Thanks for that, that's pretty much what the diagram I looked at last night says. Yea it's already overboosting and boost cutting coz last owner put MBC in and it's been seized right open so it just free boosts till it hits boost cut. Want to replace it with one that's working and wind it back to around 10psi.Would normally go: (as you'll see in the thread mezje linked)
Barb on plastic elbow (pre throttle) -> tee to solenoid and metal line that splits to each turbo -> wastegate on each turbo.
other port of the OEM solenoid connects to just after the air filter/MAF to bleed air.
Trace it out and can probably advise if it's right or not. but MBC is your ticket to hitting boost cut
FYI, the hose with the red end painted has a restrictor in it. See if any of the hoses have a red end painted.