Heat. Heat. And more heat. That's the best way to remove it. Get the area on the manifold glowing red with a torch not the stud itself. Acetylene works best but MAPP can do it in a pinch. You might have to remove the manifold to gain proper access so be careful removing the eight bolts that secure it to the head.
In the future a word to the wise. Always use an impact wrench to remove the nuts from the studs on the manifold. When you do it by hand you are continually building up torque until the stud snaps. Using an impact wrench reduces the amount of torque the stud sees. At the worst, the stud will come out WITH the nut still attached. I almost never break studs when I use my impact wrench.
Good luck.
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