Unless you can manage to wiggle the whole assembly out, which will then allow a little careful twisting.
After you have separated the header and mid-pipe, try the electrolytic de-rusting trick. It's amazing.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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