there are heaps of nissan turbos that look the same. the rb25 looks very similar to the vg30. i've got a few dud ones sitting at my work i think the vg30 has the 45-v4 markings on the compressor housing. these turbos are not worth playing with they pretend to be t3 but they are really made by hitachi and no one has parts for them. i found out the hard way after the rb25 turbo blew an oil seal and i got 2 vg30 turbo that were duds as well. the rb25 turbo also has a paper thin compressor wheel compared to the vg30. make sure your turbo actually came off an rb25 cause vg20,vg30,rb20,rb25 turbos all look similar