Hi!
If willing to import from Sweden there are at least these brands of stainless exhausts:
I assume some independent Volvo specialists/performance companies in UK, forget their names now, imports stuff from at least either Ferrita or Simons.
Standard:
https://rakaror.o.se/avgassystem/volvo.html
Sport:
http://www.a-alt-avgassystem.se/rost...ortsystem.html
Both standard and sport:
https://www.ferrita.com/sv/produkter.../volvo/740-745
Chromium steel, sport:
https://simons.se/products/sportsyst...vo/940/940/384