i don't know anything about the water to air intercooler but i know for a fact you would be just dandy with a big top mount. there would be less lag and if you're worried about heat soak, don't be. its not as big of a deal as most people make it out to be. yeah the top mount will get a little heat soaked if you're sitting at a light but honestly, how often do you get on it from a light anyway? plus, as long as theres air moving through the intercooler, its cooling the air coming from the turbo. i have a process west top mount and i have no complaints. hope this helps.