The fact they are the front 2 studs makes it a better job. i would go through the trouble of removing the manifold as its probably warped and needs to be sanded flat. Take it to the auto parts machine shop for an A1 resurfacing job, or if you are a gear head, just get out your belt sander and finish it up with a flat file. I have heard that heating them up and applying a little candle wax will allow them to come out. I have never been that lucky, they always snap off close to the block so I have had to drill them out and use an ez-out. That you can get at the auto parts store. Good luck!
...Daughter going off to college next week...she's got a 2001 Isuzu Rodeo 2.2liter 4 cylinder..used to belong to her grandpa...he paid about 1500 bucks a few years back for a full exhaust..it started to get noisey and when I checked it out I noticied the front 2 studs were broken off in the block.Is this a hell of a job?..I was gonna try and heat em up and back em out with visegrips ...school starts next tuesday ...should I wait till we can get it to the garage???