Highest flowing CFM electric fan that ACTUALLY fits?

What are you working with? What radiator do you have?? Mow much room do you have to work with (water pump to radiator)?

What he said. How can we recommend a fan if we don't even know what radiator you have? The core thickness and width will determine what fans are even an option, ie, 22" vs 26" makes a huge difference.

For example, my Ford Contour fans fit great, but that's with a 26" 3-core radiator.