......and back to the original topic

I've now done a little more research and it seems I may be able to buy a nice tight 90* bend (52mm radius) and add tube either side, one with a socket. I'd just need a few careful measurements and perhaps extend the extend the centre box supporting bracket.

Cost of the bits is probably about £40 delivered.
So, my next questions are how easy would it be to have the stainless tube butt welded? Is this a specialist task or can most exhaust fitters normally do it? Is likely to be
expensive?
Cheers