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The problem is you don't have a wastegate. The wastegate should be where that spring is with a vacuum line attach to the compression side of the turbo. Compression side meaning anywhere from the housing to the intake mani, but the turbo compression housing is best, keep the vacuum line as short as possible.So right now you have nothing to bleed of excess boost and if that engine isn't tuned for 20 psi it might go boom boom.What model of turbo is that? Did it come of a car?Your best bet would be to get a replacement stock wastegate or you'd have to modify your exhaust manifold to bolt on an external.