broken exhaust stud removal

To start with "Never Panic" like others have said the start is everything!

Drill centered and straight and keep going to a larger bit till you are just short of threads and fully through the old stud. Then use the extractor if needed. Most often by the time you get to max drill bit size it works itself loose and you can spin it out by hand.

The last one I did I got over confident and broke the extractor. Used a center punch at that point to drive the extractor through into the water jacket. Went one more size larger on the drill bit and the rest spun out. Patience is everything!