You have to have a by pass valve, BPV, or a blow of valve, BOV in a turbo setup to relieve the boost when you let off the throttle.
If you already have a BPV then you don't need a bov. If its just a turbo with a waste-gate, and no relief it is dangerous as hell.
Somewhere there has to be something to release 8 psi of boost when the throttle is released.
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