Yep. That's what I did. I pulled the fan relay box out of the main fuse block along with the wiring, and only used 2 relays to kick a single fan (5 blade fan appears to pull more so used that by itself) on at full speed if needed and can run dual or better fans down the road. Fan needs power to both relays on a single fan to get full speed, like it's paralleling the windings or something.
Truck has 2.8L w/iron head, intake, and block and runs at 195 degrees stock. With just the single 5 blade fan zipped to the radiator INSIDE the stock shroud, the truck stays at 195. Pulled a 2k pound trailer with the 3k+ pound Legacy on it (figure 5k pounds at least) and the fan was enough to keep it at or around 200 degrees when the poor truck struggled on inclines from a stop (silly thing couldn't get over 25-30 mph until the road leveled).
So, it seems to be a decent flowing fan and even better is they are virtually silent, even on the high speed.