Re: Darn exhaust
If the break was in the same place, ie the weld into the box, I would suggest that you check/replace all the rubber mountings from the cat back.
They tend to stretch after a while, one of mine had elongated by another 50% (about 3cms).
My rear silencer had split in the same place as yours, and when I replaced it, I also found the centre silencer (the big square one) had started to split on the weld on the inlet.
When I ordered a replacement exhaust, I also got new mountings and was surprised at the amount of stretching that had occurred.