There are a number of coolant supplements and coolant additives out there like Evans NPG, Water Wetter, Blue Ice, RMI-25, etc.... I have tried a few as of late and RMI-25 seems to work quite well. It doesn't necessarily keep the mixture cooler by nature, but when heat soak starts to set in (like from a WOT blast), it's intention is to help remove the heat a little faster. Combined with a large ATR upper, CAS lower, p-side fenderwell routed lines, dual CCHE fans, a Jabsco pump, and the above mixture, my intercooler has become quite efficient. A good 75 deg day and you can make consistent WOT blasts while driving (60-120) every couple of minutes and the MAT temps never creep above 100 and come right back down rather quickly. I don't know necessarily if the additive has a lot to do with my results, but I'm sure it can't hurt.
This is just my experience and I have always had good luck with cooling (ask Waller
), but maybe it will help you out some. For a stock setup and most others, regular coolant/water mix will do just fine.
HTHs
Michael Hood
Syclone #1596
GAST
