Update: I had a new pipe soldered in and it seems to be fine, for the reasonable equivalent of EUR 300. The rest of the silencer is in good shape, apparently.
Now I'm looking for the section of pipe that runs between the catalysts and the backboxes (see attached diagram, number 2). Rimmer's website doesn't even have a part number so any kind of research is difficult. Is there a place I can find the part number for this?
Exhaust pipe middel section.jpgScreenshot 2022-11-10 at 09.37.58.jpgbackbox soldering.jpgZT-T rear.jpg