Grab yourself a one of the high performance SPAL twin fan set-ups with controller and twin 40 amp relays. They will clear your water pump and dramatically outflow your current single fan set-up.
Like I said though if his cooling system isn't up to keeping his temperature down and the study 40 miles an hour and up those fans aren't going to do anything for him ultimately. If they do they're a Band-Aid for an inferior cooling system...
