the stock fan is on the engine side of the rad. so it Pulls air through the radiator.
i am not sure of cfm of the stock fan.
whats your rad. condition? maby its time for a flush or new rad?? and how did your clutch fan fail if you don't mind me asking?
if your doubting a single fan maby check out this:
http://www.celicasupra.com/forums/sh...oducts-Catalog
ive been reading it and i already want one. the two fans pull 2500cfm.
but i don't see why 1600cfm would not suffice, IF your running a stock 5mge.
also some custom mods to keep air flowing through the rad. instead of around. would be good.