The key to getting that broken stub out is to start out right. Take the intake off. Use a dremel tool or a 3" angle grinder and disc or a mill file and get that stub as flat as you possibly can. Then center punch it just as perfectly straight as possible. Then use a nice sharp 1/8" drill bit and go all the way through as straight as you can. Then a 3/16". I think that bolt is 5/16" not 1/4" as mentioned, but keep making it larger until you can use an extractor to take it out. It is the factory bolt, so it isn't bottomed out. It should come out pretty easily. If you have access to left hand bits, it may screw itself out once you get to 3/16" size or larger. I have to deal with broken fasteners like this at lease once a week. Some come in that way, some I cause. We all make mistakes.
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