Ironically, the highest CFM rated single fan that SPAL makes is rated at 2,000 CFM. Which makes your cooling system one of the least capable posted in this thread.
Spending the most money is no guarantee you get the most capable parts, it just guarantees you spent the most.
And if a 2,000 cfm pusher is all you've ever needed to cool your 970 hp engine, well, I can guess the kind of driving you actually do, and it involves a lot more trailer than real driving.