lots of people do CAI already, and i dont think the CAI will route the water directly into the intake...the water/rain would stick to the CAI inner wallls and will disperse slowly... it wont be like water hose u use in ur garden one...
second of all, CAI is just a long piece of bended aluminium hose, to direct cold air towards the air filter... in some cases, no filter at all... it is not connected directly the the intake/air filter... so, even if u pour the water thru the CAI opening, there would still be some gap/distance between the end of the CAI and ur airfilter....of cos some would end up on ur airfilter la, but i doubt the quantity can affect ur engine tremendously.....consider also the air turbulence inside the CAI b4 it reaches the end, i dont think the water can fly thru it without hitting the wall first la..most CAI would have a bottom-up setup...so, do u really think the water can go up the bend and enter the air intake??
if its done correctly, there's nothing to be worried about...:shades_smile: