I was very curious on the matter as well, so I installed a 9C1 cooler that has the 9C1 cooler before the radiator cooler. I haven't driven it very far or very long as of yet to see how much hotter (if at all) it gets, but I have noticed on the short trips I drive it on the transmission gets warmer a lot faster. We'll just have to see how it does on longer trips whenever I take one lol.