How to extract mangled manifold stud?

[eacmen]

I have not used this on an exhaust stud but this tool worked well on stuck wheel studs.

GEARWRENCH 1/2" Drive Stud Extractor - 1708DD https://www.amazon.com/dp/B000CODE0W/

might need a smaller version tho.


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[WOLFN8TR]

Ya soak it with some PB Blaster over night. I would heat the area around it before trying to remove it. I’ve used these Craftsman extractors in situations like this with success. I would trim 1/4” off the tip with a deemed first.

[Tbonem3]

Has it been soaking in penetrant? You can try heat too. Maybe drill a hole, perpendicularly, that's half the diameter of the stud and slot an icepick or punch and use that to turn it CC? Hole would need to be large enough to accommodate a piece of metal rod (or icepick or punch) that's not so thin that you just end up bending it.

[Cubieman]

So I tried double nutting this stud, then slotted the front, then ruined the threads by using vice grips, bad decisions led to this situation and I know that.
Before I start reading about how to remove an S54 engine could anyone give me any tips or tools that may work for this mangled stud?
The stud is the type with the etorx end/shoulder. There is enough threads left to run a bolt right up the shoulder somewhat securely, but the majority of the threads are toast.
Most stud pullers I see in the local stores look too large to fit.
This stud was installed about 8 months ago, then removed last weekend and re-installed but the stud didn't go all the way in, I went to remove it and accidentally used one size too large etorx which rounded off the end. I have since made this worse and worse. Its REALLY in there, my buddy put it in and likely went too tight, I very much regret my decision making as far as letting another person convince me to take some of the studs out to facilitate easier installation of the headers.

The way I see it the only viable option would be to have a nut welded to the stud and try it, if that doesn't work I guess it's engine out for a proper drill/tap. Wow.