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How much of a restriction is the stock exhaust? I have a 91 Spirit 2.5 turbo, ported head, intake and exhaust manifold, T2 Daytona IC, MP controller, grainger valve, 88 T2 garret and stock exhaust with no muffler, it has a stock resonator behind the cat. Is the stock exhaust enough of a restriction to limit boost to 12-13 psi? I've tried unhooking the wastegate vacuum with little to no effect.