I know with a cai you can mess up the engine. But if you don't go through like rivers, you should be fine, right? If you're on a street and you have to go through a puddle, how fast should you go through it and how deep does the puddle have to be to hydrolock the engine?

 

On the street it would have to be deep -> like a flood or maybe like a hurricane flood depth. I have always had a CAI on every vehicle I have owned since K&N came out there theirs.

Never had any problem at all.