Check with a tuner, but i would have thought if u fitted it and wound the actuator out so its peaking at fuck all boost say 10psi just so u have some it should in theory be ok as it wont be boosting to more than ur T3 was running specially if its stge 3 spec.

But as i say would be best to speak 2 a tuner to be certain its a safe thing 2 do.