I have replaced two cats on my +8, at around 42k and 50k.
The first place I looked was the racing guys who ditch the cats for better performance and the first time I was successful , but for the second one I bought one from a supplier similar to the above, but again it needed both ends modified by cutting my old ones off and re-welding onto the new unit. I was concerned about the extreme heat of welding affecting the honeycomb structure but the welder assured me the result would be fine , and it was.
Sorry that I can't identify the supplier from memory but will post if I find the paperwork.
