If you read my earlier post from 2023, I had a similar situation. I removed the exhausted, cooked the stud with a propane torch and then hammered on an extractor socket. That did the trick.Nope. I did it on a LX that I sold and I did remove the exhaust section.
I would think it's possible to do it with the exhaust still attached, but only if you have minimal rust.
I'm about to do it again on a LC and I'm going to remove the exhaust and do it right. Re-tap the threads and properly torque the nuts.