Let me try, mainly from my old Talon. You might be confusing between wastegate and wastegate actuator.
Wastegate is the door in the turbo.
Wastegate actuator is the one that control the WG to open & close. (Spencer: explain in the 1st section)
Boost controller is necessary to get more adjustable boost. A WG actuator have a set PSI. You can try to bend the actuator rod or shim with some washer so it open the WG later.
Stock WG start to leaking a little when the turbo build up pressure close to stock setting (12PSI). On my old Talon I used manual boost control (MBC) set at 16 PSI. This is connect inline with the WG actuator. The actuator never see any pressure (0PSI) because of the MBC block all the pressure. So WG remain fully close. Until MBC open at 16 PSI it let all the pressure go to actuator. The actuator will fully open when see the 16 PSI which is more than stock (12PSI).
I hope that make sence!!
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