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I've never taken off my CAI during heavy rain or while washing the car or whatever. The water has never been a problem, and I don't think they ever got past the filter anyway.
Like what someone else said, it's only going to free up probably a couple HPs. I personally can't tell the difference. However, without the cold air extention, I could feel the car having less power on really really hot days. I'm guessing the CAI will help more on very cold days.
Isn't it supposed to be something like +1 HP per -10 degrees in temperature?
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