I run a 14" SPAL puller fan on the civic drag radiator. Its rated at 1720CFM.
Never had any issues with the car overheating or running hot.
This is on a 91 galant vr-4.
got it from here:
Online Catalog - Spal Cooling Fans and Accessories
you can go on summitracing.com and jegs.com to check out more fans