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No. . . . bypass valve only gives problems when the supercharger goin.did you replace the vacuuam line on the turbo itself cuz if you did with a smaller diameter pipe the turbo wont run as much boost. . .I had a 3mm internal diameter pipe the on my last st and only made 4-5psi. . .put the standard one back on if thats not it could by crossed vacuum lines  or a bogey turbo


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