I've seen some testing that shows that you need to fully submerge the filter in order to start pulling water. Not sure on the validity. However, the AGP CAI is sectional. You can convert back and forth between a ram air and a cai (at least on mine I can).There really isn't that much of a bonus to locating the air filter down there. In fact, from a pure performance aspect, a CAI isn't really any better than the stock airbox. Yes, you can hear the turbo more clearly, yes, it looks cooler, that's about it. There are people who will argue that there's "very little chance" of hydrolocking the engine from the air filter in that location, I don't like the fact that there is ANY chance.