I do not run a small radiator in front for the water coming out of the air/water intercooler. I found that the extra plumbing (hoses/radiator) actually led to higher air charge temps because it slowed down the water as it circulated from the tank in the trunk, through the air/water intercooler, through the small radiator and then back to the main tank. I dropped over 30 degrees of air charge temp by just having the water go from the tank, through the intercooler core and then straight back to the main tank.