I am assuming you are concerned about the CAI sucking in water... it rains a lot where I live and I have never had a problem. The plastic under the break duct is enough to shield any spray from the road, so unless you drive through a lake you should be fine B)
Yeah, the cover helps and I dont think anyone who drives a bimmer would actually drive into water greater than 2 or 3 feet deep either. Also, if there is any spray from the road, it would have to go throuh the filter first which it would separate and trap some water and turn into smaller droplets, then it would have to survive the heat within the tube, and by this time, it should have turn into vapor by now. Besides, the car is moving, so its like a mist if it even gets in there. Take a look at where a CAI is goin to be placed in your car or a friends of yours and youll see taht its pretty hard for water to get in there. Are you planning on getiing one yourself?
well, i actually have had some problems with that. My philter reaches all the way down to the bottom of the front bumper, and ther is not shielding between it and my tire. So when it rains, my tire sprays all of it's water right into my philter. I've actually had my car die twice when it was raining and that is the only reason i could find for it. So being that i live in north west washington, where it rains all the time, i'll be putting in a shield sooner than later... But as for water spraying up from the ground, that shouldn't be a problem. I don't think enough water could spray up to harm anything.
Just remember that K&N filters are soaked in oil. Water doesn't mix or dissolve oil so it won't wash away.
The plastic bumper or underpanel shouldn't be your main concern. Lots of water can get through the brake ducts, fog lights, etc. Even eaiser if you have the M3 bumper. If you're anal about water getting into your engine, switch back to the airbox design in the winter, or position the filter right behind your headlight and use a heat shield. That's what I'm doing. I run a duct from my custom made foglight inlet ducts and run it up to my filter for track. in the winter, I simply close up that duct. Water will still get by the headlight, but not as much as if you had it positioned behind the bumper. You would also need to clean the filter every year.
I have a K&N filter I use for winter and another I use for summer.
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Ahhhhh its good to have confortii with the heat shield
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I also have a Dinan style CAI that sits in the lower front bumper. I cut a hole in the brake duct to provide more air into the CAI, when it rains i just tape up the hole and then take it out when it is done raining. I've never had any problems when it rains, then again i'm from so. cal so I really don't have a big rain problem.
I've heard of people using a special "filter sock" that the CAI can suck in air from if the K&N gets soaked.
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