either though. I would expect that the Koyo radiator and electric fan is going to cool better than an OEM radiator and OEM fan. The question really is whether it is operating within acceptable temperatures, which it appears to be. You aren't going to keep your engine at 180F while running continual hotlaps at any roadcourse even with an OEM fan, regardless of what radiator you have. It may be a few degrees higher with an electric fan but so long as the threshold is not exceeded IMHO there are more benefits with the e-setup than the OE setup.