If you are worried about hydro lock you should look at getting a Comptech Icebox. Or even making one yourself (that is what I am going to do - getting a K&N Filter and working on the tubing myself). It looks like an interesting DIY........

Here is a pretty good overview on intakes in general

http://www.zhaust.com/tech/0702/intake/


And here are some links that I found helpful regarding the Icebox.


http://www.geocities.com/bretq/DIY_Icebox_CAI.html

http://honda-tech.com/zerothread?id=176838

http://www.honda-tech.com/zerothread?id=176525&page=2

http://www.sandmracing.com/scomptechicebox.html

http://www.comptechusa.com/instructions/ins075.pdf

Good luck.....