With 4" of water I would drive that all day. To suck in water with a cold air intake you have to totally submerge the entire filter under water. That would be about 1 1/2' of water.
The bypass might make you confident but it actually does no good. It doesn't open in time to do anything. The intake will act like a straw and just suck the water in as fast as you pass through it. And I don't see anyone purposely driving through a foot and a half of water unless if t hey are trying to total their car.
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