Fark!!!@ Crazy numbers.
I thought much the same re: the blades, however I friend made something like 320rwhp on his rb20 with a truck turbo (well size bit bigger then hks old school t04 size), cooler, fuel and mines ecu ect. Was laggy as, and not a streetable or usable 320rwhp.
I can get the units for... lets say cheap. Cheap enough to have a turbo shop to put new wheels in, duno wether its worth it cost wise, never done the RnD.