As long as you have the skidplate under the car and the inner tire fender well yuo'll be fine as long as you don't drive into a DEEP puddle that you shouldn't drive in anyways. I've had my CAI for years in multiple states and when it rain here in AZ IT RAINS! You shouldn't have a problem with a true CAi, but if you're really concerned go with the SRI. Even a warm air intake is better then the factory crap.
2012 Focus Sport, MBRP exhaust, COBB Filter/Snorkel delete, ST Wheels, Toms Tune, Shark fin antenna
SOLD2006 SAP, Draxas Header, MBRPexhaust, CAI, Tuned, FRPP lowering kit, SVT 5spoke wheels, HaloProjectorHeadlights, Mazda rearwiper, mustang antenna