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If I were to do this in the future, I know some guys who make some very sexy manifolds so I don’t think that would be an issue. Some reading suggests that the standard manifold is good for 500bhp which is probably sufficient, so probably more economic to machine the standard manifold to accept different turbos but probably more exciting to get a tubular manifold built for a GTX
NurseHolliday
The Garrett is well sized for the 2.3 5 pot.
In terms of manifold adapter, you can either mill the Volvo manifold flat, or you can use an adapter- problem with the adapter is that they tend to leak.
The US guys call bullshit on this, but they tend to use full power for ~10 seconds, then mooch around at partial throttle for ages, feedback from UK 850 owners who visit the Nurburgring is that the heat makes the seals life a hard one.
The TD04HL that you have is a 20T - which is pretty unbalanced as the exhaust side is shared with the 16T, but the compressor side is significantly larger. It's the Volvo pattern on the hot-side though, so it all bolts on and there's no seal issue.
These engines respond very well to a larger hot side, if you can deal with the manifold issues.