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burn it out as much as you can, then cut through the remaining metal collar with a sawzall. be careful not to notch the subframe.
once the metal collar has been cut through, wedge something into the cut to peel the first edge away from the surface. then jam a screw driver (and eventually a pry bar) in there, and go around and pry until you have a good portion of it loose. then hit it with a hammer and it should pop out.
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