Short ram vs. CAI

[Kracka]

Simple rain and a wet filter won't harm your engine, but if the filter gets fully submerged it will suck water in and hydrolock aka destroy your engine. If you're careful about it, do it. I had my air filter in the stock sidemount intercooler location (down low in the bumper off to the side) on my '94 Talon and it was fine in heavy rain, but if I saw a puddle in the road I found another way home. If you do it be very careful of standing water and make sure no water from above can drain in the filter. The S2k's have a hood water drain that drips directly onto the AEM CAI filter and a few people have hydrolocked that way, but now AEM designed some sort of umbrella to protect the filter from above.