unkle chop chop

hey cheers but im not quite sure im sorta new to the whole turbo thing.. hopefully this pic link works and someone could give me a def answer... thanks

hey like the title says i have a turbs that im not quite sure what its from... i have done searches on ns.com and google but it keeps getting me more confused.. i have been told my turbs is a rb25 or a small turbo off a vg30 twin turbs setup.. but i bought the turbo as a vg30 single turbo as it is to go on my silver top... teh turbs reads NISSAN 45V1.. please ne help would be greatly appreciated... and also is it suitable for my 20? thanks in advance