Well i have had my Stinger out in torrential rain for past 3-4 months. We have just come out of our winter here in Australia. Hmmmm car seems to be running fine, hasnt pulled rain into intake. Lol. Sorry but unless your Stinger is a Submarine then you aren't going to have any issues. Would be more likely an ingress of water on a sealed system like factory.
Heck our 17 Ford Mustang GT has a similar SEALED intake from the factory and no problems. Unless engineers at Ford stuffed up. Ok so heres something to try. Get a straw and cut a hole half way up now put the straw into a cup of water and see how much you can suck up?
Water is much denser than air, meaning the filter will pull air in over pulling water droplets in. Remember they are an oiled filter, they dont have the oil sucked out of them