Quote Originally Posted by Josh Ehlert View Post
A manual boost controller does not add pressure to the top port of the wastegate. I suppose you could be talking about an electronic boost controller but I doubt that's what the OP has.
A Manual boost controller does add pressure to the top of the wastegate. That's how it works. Darkhorizon is right about a lot of what he says. He has an awesome 3800 turbo engine. Get a boost controller and turn it up to 12 pounds the engine will handle it just fine I've ran 12 pounds at the track with my Z3 kit and had no problems