There's a standard reply in this group to those sorts of projects:

Better to buy a car with the turbo motor already installed.  Cheaper,
better install, better resale, etc.

There are some serious freaks who do weird stuff like dropping an UrS
(AAN) motor into an 80q or 90q - but they like the process (I'm
guessing) and not necessarily the result.  Although, the stock AAN
@227HP in an 80q would move it out pretty good!  It would also surprise
the hell out of a few stoplight racers...

Go to Audiworld.com and search - I think such swaps have been
discussed.

Good luck,
--
E.P.

1996 UrS6

Apparently you are talking about the T44 series. It can be done but you would
also need to swap the wiring harness, computer and probably the instrument
cluster. Cheaper and a lot easier to source a 200.