Has anyone ever changed the stuf from the cat end of the exchuast manifold?

One of mine is stripped and just holding but won’t last long wondered if I’m dreaming thing i can just pop the inverse torx bit on and unscrew it without snapping or if they do come out easily? Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF