I measured a few car fans and reached the conclusion:
Most fans are not what is claimed in advertising or Internet.
Some low-advertised fans move far more air than fans advertised or assumed to be larger.
Much of how things work depend on how air is routed and how fans are installed.
Adding a second fan in front or behind can help flow substantially, more than sum of the parts. It could also hurt if the fans are incorrect compliments or the air isn't routed properly, but unless you have a low air flow fan teamed with a high air flow fan, a second assist fan will generally help.
Right now in my LX starting from nose (bumper removed) and going back toward engine, I have:
Trans cooler (large) 15" x 20" x 1.3" maybe
VW Golf or Jetta radiator for intercooler water
Home made shroud and large single puller fan
I could not reasonably fit an air-to-air IC up front, but I could add a thin fan. I don't think an additional fan would help me much, but measurements have shown I need more air opening and better pressure control up front in the Mustang OEM air inlets. I have plenty of air stopped, but not enough flow assist from nose pressure when cruising.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)