I have a couple of these or similar turbos. Not much info on the net, the Volvo guys tend to think the turbos are nothing exciting but no info was offered why.

They have variable compressor vanes giving more range however the vanes need cleaning because they stick.

At the moment I don't have a matching pair. When I do find a match I'm thinking of using 2 on a 1997 M104 3.2 Inline 6 to give some low speed push. I'm not so concerned about top RPM power though.