Im saying that because he has a VP...RPM limited..even with a redline box. Which ive played with the major ones (Quad 4K first box before the new chip, TST Comp, Edge Comp hot unlock and Redline Unlimited)
480's have been run on vp trucks but the ones i have seen are late in the range and under driven. The compressor maps that ive looked at show it a little out of "MY" rpm range. Now with that said billet wheels and lighter compontents will always help out but the turbo shops that i talked to when i went to twins advised against it and only suggested the billet 478 as the biggest i should go to with just the VP.
Now with the ppump youll have the higher fueling and rpm to match it up better.