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I would get the Apexi boost control solenoid. Electronic boost control is the best method. Having the ECU do it is even better.
A standalone electronic boost controller (EBC) would be my second choice. Like a GReddy Profec B, or AEM TruBoost.
The HKS actuator would be my third choice. It's half the cost of the EBS options above, but gives you no ability to grow. IIRC, it's set to 12 psi. With your setup I'd be aiming for 15 psi (assuming you have >550cc injectors). But it's only a single boost pressure. The adjustable rod changes the boost curve, not the boost pressure.
My last choice would be a manual boost controller. They spike pretty badly and could end up blowing a motor.
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