This always kills me... other than what the garbage "we dynoed it with and without (two weeks apart)" writeups always say, just how many HP do you think it takes to move a fan while the air is already moving toward it? A few, tops.
If you've gained anything it's not much. It's unlikely that you've lost any, but I doubt you've freed much up and it's no more than you could have freed up with simpler and less expensive solutions like a new (see more efficient) water pump and an aluminum flex fan.
There's balance to everything, you can only ever go so far with something before you start incurring losses.
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