Yes, water will cover the whole car. The whole entire car. I would think. I mean, if you submerse a car in water, it will sink. But if you have an intake system witch is better than stock, you might come out better than if you were stock. I'm not claiming to have found answeres to the univers, just maybe a new look on things.

2001 Sportage, 4" RSG lift, Cragers W/31 10.5 Micky Claws, Warn Manual Hubs, 16 gallon Pro Street Fuel Cell, Custom Snorkel, K&N Filter.
1989 Dodge W250.