Zerocool the guy who originally installed the MPx90 said they recommended cooling for all of the boost options. No testing has been done though as far as I know. Which is why I'm getting the aftercooler before I start. You could always go with a bigger injector and run E85 if you have issues with IAT and no cooling. make more power that way anyway Just sucks that only 1 person has done it and his technical information was minimal now hes MIA for months with no updates.