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Yup, copper high temp anti-seize on the exhaust studs.
Funny thing about exhaust studs. Engineers know how to keep them from breaking off, they just don't do it in the vast majority of automotive applications, even in high temp turbo applications. Cat and Cummins class 8 engines bolt up their exhaust manifolds with longer studs and a 1-2" spacer under the nut. And they rarely break.
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