Water is no problem. At the opening where the Intake hose connects to the firewall You have two things going on. !.) The opening is 1 1/4" above the floor of the cowl area. The cowl area has a drainage system in-place for draining water off that comes in from the windshield. 2.) On the inside of the cutout on the firewall I built a intake "CONE" with a flaired end with a screen in it. The last concideration is if you look at the picture you will note that the intake hose travels uphill from the firewall, over the strut tower and then back down to the airbox. IF any water did enter the intake hose it would just run back to the lowest point which is out the intake cone in the cowl area. IF the water did make it over the hump it would run to the bottom of the airbox and out the drain hole.