What is water suck?
Spend some time on the Honda-performance mailing list, or on any number of the Honda specific web boards, and you'll hear someone saying how they just got a new intake and now they are pathologically afraid of getting any water in their engine. They suddenly seem afraid to venture out in the rain.
What is water suck? Simply put, it is an occurance wherin a large amount of water gets introduced into a running engine. Being a liquid, and thus incompressible, the water fills the cylinders and abruptly stops the engine's rotation, causing a large amount of stress to the pistons, connecting rods, and crankshaft. Usually this stress is very high, causing terminal damage, and the engine has to be disassembled and parts replaced. Needless to say, this is bad and should be avoided.
So all water in the intake is bad?
Nope. only when there is sufficient water introduced to a piston to prevent the motor from fully travelling the compression stroke will this be a problem. In fact, water in the intake can actually be a good thing. Many ... bla, bla, bla, no time to finish now...
CoNCLUSIoN
While not impossible, water suck is not very likely as long as you drive with your brain engaged. I have yet to hear a story involving engine damage done to a car by water that wasn't due to the driver being unnecessarily careless. The amount of fear regarding water suck is absolutely disproportionate to the actual danger as long as you think while you drive. If, even after reading this, you still feel uneasy about sucking water into your engine, don't get an intake which makes you nervous! We're not talking about a 40hp difference, so if it makes you feel less worried, then just leave it off!
Don't buy something if you're going to live in fear everytime the skies cloud over.
-http://integra.vtec.net/geeser/