I hate to be the bearer of bad news, but that stud is going to be a BITCH to get out. That stud has been heated to 1600+ degrees, thousands of times. Every time that turbo and stud expand and contract, they seat more and more. The stud is also 5 zillion times harder now. That being said, I have done this and I still wimper when I think about it. put some penetrating oil on it over night. Heat it with a torch, use a very small titanium drill bit to get things started. Be sure to lube the bit while drilling. This will give the stud some room in the center to "stretch back in" if you will. This task must be done in baby steps. Snapping off another bit or an easy out will double your time, so be patient. Keep heating, and slowly increasing bit size. You will eventualy get it to a point where you can dremel in a slot and twist it out with a small chisle and hammer.