Uh, yeah... why do they use 120mm fans on a radiator that big? Why not use one of these? The only way you could outflow that with 120mm fans is to use 15 fans that flow 120cfm+, and the only two I can think of off the top of my head are YSTech and Delta units that are so loud that there are probably laws against using 15 of them at once...

Better yet, why not just build a shroud and use two of these? I pulled the 16" one off the Mercedes the other day (the parts car, not the one I drive) and it moves a lot of air. It also sounds like a prop plane. And, it draws enough power to make a molex connector burning hot...