Pic would help, but it sounds like you’re talking about a stud in an exhaust flange. Those can be just press-fitted or tack welded. Easiest approach is remove the pipe, secure the flange against a vise anvil, etc., get the flange hot, and beat out the stud with a big-ass hammer.
If it’s welded, you may need to drill it out.
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- Broke exhaust bolt