i think the metal line your referring to is just the actuator arm, it pulls/pushes the wastegate flap in the exhaust housing, the lines you are after are at the front of the turbo. give me a minute and i'll get you a picture.
edit - Heres the picture
Basically the actuator keeps the wastegate closed until pressure in the compressor reaches 7psi, once at 7psi the actuator will opens the wasteagte to stop boost getting higher than 7psi as boost drops below 7psi the actuator closes the wastegate again. So its continually open/closing and keeps boost at 7psi.
Do you have a picture of your boost controller? is it electronic or a screw type?
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