Quote:
Originally posted by warmonger
One important fact about foam you should know. It is water absorbent. If you pull water in, it will become saturated and cut off air flow to the motor. Better than hydro-locking I guess, but water can still penetrate. You just lose motor power sooner in a foam filter due to that lack of air flow. I have seen them shut down a motor when splashing through a deep mud pit even though the front end wasn't submerged. The foam became saturated enough to shut down the motor, forcing a dead pull out of the mud pit. Not a good scenario if you don't have either a winch or one big SOB of a truck to make the dead pull. If you don't drive in mud or water, go for it.
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A K&N will just suck water straight into the engine bay, and a stock paper element will as well. If you get in water deep enough to suck it through your air box, I think you've gone somewhere you shouldn't. I wouldn't consider that a prbolem with anything but those cone filtered injection systems. One of those is what claimed a buddies Tacoma 3.4L V6 to a hydrolock to the tune of $6,000!