I have used the FSR dual 13" SPAL fan kit. The biggest problem I had was that the wiring harness would overheat the fuses would melt. With a better harness, that problem might be avoided. I don't remember whether I have overheated when they're functioning correctly. I'm not sure exactly which SPAL fan they use. 2x brushless should be the most possible cooling.
X-RPM.COM is the only place to get the original FSR TBSS RADIATOR and SPAL FAN SHROUDS Light weight all aluminum radiators are hand welded and pressure checked. They have drain petcock and factory style mounting. Drop temps by as much as 30 degrees or more. Double the coolant capacity. SPAL...