Jay95R33 - I have a mate that has a R33 GTR and you can't hear the pump in his car either. That's why i was getting worried. Maybe they have insulation to stop you from hearing them.
But, after making some phone calls, getting the pump checked and judging by the comments on here, the pump is 100% fine.
GTST - It is a R33 V-Spec pump so i'm not sure of what it flows, i just know it performs much better then a standard one !!!