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Sadly , I’ve seen this a few times over at the facebook group , usually you could try these tricks:
- Drill the center of the bolt with a HSS bit, until the bolt-head splits
- or get a hole saw drill bit that is HSS about 12-14mm size (A guess) and drill-saw the area surrounding the bolt. Then the flange comes off by pulling it off with tools.
- The bolt that is left attached on engine-header, get large mole grips & wear bike gloves , try to undo it hard to loose.
Mind you, whatever happens here, you may end up replacing the stud & nut or a new exhaust bolt!
That picture ^ that bolt is a security torx bit. It is size T30-Security Torx. very notorious bolt to fight with sometimes.
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