That's actually a healthy sized turbo. Looks to be a full T4 exhaust housing. Bet it pulls pretty nice on the top end and still spools well with the 4.0. Do you know the specs at all? I know it's not a GT series because of the lack of water lines but maybe a T04Z blowzilla or something?
Edit, just noticed it's an E cover on the compressor and not an S cover so no blowzilla, it's a .60 AR. Any ideas on size though man? And what is he using for management?