Hey guys...
I currently am working on my 1997 VW GTI VR6, shaving the engine bay and, hiding all the wiring, generally improving the car.
I'm about 1/4 done and I've gotten to the part where I want to improve the cooling system.

I've already pulled out all the unecessary parts and pieces(coolant reserviors/by-passes) heater core, a/c parts, power steering. The works!!!

I've already cut out my stock fans(they weigh 20 lbs) and protrude into the engine bay.
My radiator surface area measures 24.5" wide by 15" tall.

MY MAIN QUESTION:
1) What is the ground-rule CFM requirement for a 6cyl motor?
Providing the car will be run slightly warmer than daily driven operating temps(track/drags)

2) CSR's website has the best CFM/Cost ratio. When putting two 11" fans next to each other, do I add the CFM's from the two fans together to equal the total CFM across the Radiator or is there a formula???

Now, according to a few sites I've found in search of an answer to my two questions, 1600 CFM is good for a daily driven 6cyl.
But no-where can I find how to make the math work for two fans next to each other.

HELP ME GUYS!!!