I have always used lock washers with copper nuts. It is what a lot of big diesels use and I've never had a problem.
I have found that the best gaskets are OEM gaskets. I have never blown out an OEM nissan gasket. I can't say the same for mr. Gasket.
This is experience with stock manifold/turbo, tubular manifold with greddy T517Z, and now my top mount set up.
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96 240sx S13 SR20 521 WHP 405 TQ
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