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how are you controlling boost? vac line straight from the manifold to the waste gate?[/QUOTE]
I am using the factory internal wastegate that is on the turbo. The only problem that it was a HD which means the PSI range was like 17-30 psi. So I was hitting 19 psi at times! I modified the wastegate to open earlier by designing a spring assist.
Check it out if you like:
http://youtu.be/rogCn4AJYsY
To control boost, there is a port on the intake side of the turbo that connects to the wastegate.