Ok I misunderstood the original question. These are not the studs from the exhaust manifold to the turbo but the studs from the head to exhaust manifold.

I agree with SS studs/ bolts not being very strong also galling will occur when both the stud as the nut are stainless. some high temp nickel based anti seize can take care of this.
I personally would only use stainless nuts, as I did, and keep the original high strength studs.

Please let me know if the smoke issue is resolved because that is what mine is doing. First about 30 second after cold startup then less and when the motor oil is hot a continues blue haze. ( under normal load)

later J

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