Seized exhaust nut removal

[Pickle]

I have just been through the snapped stud nightmare and that was only the one. My problem was access to drill out and helicoil because the frame was in the way, at one point I thought the engine might have to come out. It was a complete pain in the chuff and in hindsight I should have used a nut splitter or dremmel and taken my time. Over 3 weeks off the road at the height of the summer.