Air to water intercoolers just have water running over the fins as apposed to air to air intercoolers which are cooled by the passing air around it. The advantages to water cooling is a consistent intake charge temperature, and the ability to mount it closer to the throttle. The down side is water line routing, and potential leaks. For our cars your best bet is a FMIC. But in my personal opinion we have a lot of run to run a v-mount setup beside the engine with a bit of air ducting it can be achieved. By doing that you have just as much throttle response and little boost pressure lost as the stock SMIC.