i checked the one i got its a vg30 and is a 45v2
but i did have a vg30 that was a 45v4 im pretty sure.u can tell the difference between rb25 and vg30 by the compressor wheel design. if u look straight down at the compressor wheel on the vg u can clearly see 2 sets of blades on the rb u cannot.i was comparing the 2 turbos today and was chatting to garret about them. that is when i found out they are a t3 copy made by hitachi and u cant get parts for them.