https://www.bsrtuning.com.au/tuning-kits/t/953/volvo-s80-ii-d5-185hp-2007-2009
What I expect to be doing for our s80d5, or RICA, one that does egr delete anyway.
It fair hauls the S80 but can imagine towing in an xc90 it would be annoying.
I'd go the V8.... We tried S80V8 and by jingo, that was fun!
Talking with Mark from Berry motor group, he owned an xc90v8 and could get an indicated 9/100 in town, his missus not so..... He had a client with one that had a RICA or heico tune and they say it had ridiculous power, I like that idea. Sure the gearbox and diff can be a issue in some but depending on how it's treated... High mileage ones are known. In fact, there was one on gumtree near Canberra I was considering, cheap too.
BTW, Berry's have two really nice xc90d5s for sale, give em a call.