Originally Posted by JimmyHat
Its a bad inlett turbo gasket. Been there, done that! Enjuku sells them for $27 shipped next day. Take your mani with turbo studs down to CFP and have them weld the studs to the manifold so they wont back out anymore and blow the gasket.
ding ding ding. Correct answer! By the way, you're losing boost pressure because so much exhaust is leaking before the turbo that there's not enough left to spin the turbo to make your 10.5psi. Leaks here are very common. You're going to have to remove the turbo and manifold together to fix it. Just to make sure you know, the gasket you need is the rectangle one with 4 bolt holes in it.