Are you sure the tap is facing the right way ?
When you put a boost tap on, it should never lower your stock boost. The stock boost is determined by the wastegates on the turbo's, so when the tap is fully open, it should be running at stock boost, and as you close it down it causes a restriction and tricks the wastegates into thinking there is less boost than there actually is running to the turbo's.
It looks as though it's plumbed into the right place, I'm assuming that top box is the pipe to the intake manifold ?
As for the small metal pipes, there are one or two you can by pass if you wish, but there is not gain in doing so really.
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