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It's common to find that since the turbo tends to vibrate and break loose the nuts. Thus creating a exhaust leak between the turbo and manifold. Nissan tended to this issue on the z making turbo locking plates which are only like 10 bucks but if your not specialized in them you wouldn't know so the common thing to do is put a nut on and spot weld it a little the the stud so it doesn't vibrate and back off.
It's a mechanics trick and is a bitch to work with after. Most likely you'll need new studs so buy them first before you take it off and wont be able to put it back on
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