You would have to drive through water that was over 18" deep and if you are going through water that deep in your focus, you have bigger issues to worry about. I have had my FSwerks CAI on my 2010 for over 5 years now. No issues even being lowered. I was worried early on until I went through many puddles or water holding areas and realized its not an issue. You would have to fully submerge the cai and be pulling enough force for water to be pulled up the tube. Don't worry about it lolReally interested in getting a CAI for my 08', but what are the risks involved with hydrolock?