That's their "CYA" statement, so if you go through a deep puddle and manage to hydrolock your engine you can't blame them. That AEM intake is really low. It's generally recommended you go with either the Stillen Gen 3, or the Z1.
Otherwise, leave it alone and put K&N panels in the stock boxes. No hot air intakes, your factory setup already pulls in cold air from outside the engine bay, so don't go with a setup that has filters in the engine bay.
I run my Stillen Gen 3, year round here in Ohio.
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