Yeah, RB25 [at least] as GTSBoy said, also has a hi mount larger turbo, aftermarket dump, probably a blitz style mount mount intercooler, alloy radiator, pod filter, and I would think an aftermarket ECU cos there is no afm [maybe cos pics are slightly from the wrong angle to confirm - looks like a plug underneath, but there is no housing so I am thinking no].
I think it could even be an rb25/30 cos that strut bar is up against the plenum, but R32's have less room there to start with. Others with more hands on exp. might confirm.
Take it to the garage he used to get it tuned at and ask them, they would know more than we could ever tell from a few photo's.