Im helping a friend who bought a turbo fox body mustang. Car breaks up bad and is boosting to 20psi. It has a ten pound spring. I see the tail wastegate top air port has a vacuum line to the intake manifold and the lower air port going to the blow off valve. I was always under the impression a vacuum line from the turbo goes to the lower air port and the top air port is open if your just running spring pressure. The turbo doesnt even have the vacuum line port. Will the way its set up ok or completely wrong