1) 3) if water gets in there, it will fall off because there is a one inch gap between the tube and the filter box.
Nope, not at WOT and high speed.
I'm a dentist. The high speed handpiece I use sprays water and air to keep the tooth cool while I'm prepping. If my assistant gets the suction too close to the handpiece none of the water hits the tooth, it just gets drawn into the suction.
The same thing will happen here. I don't know how many CFM our engines pull at WOT, but considering their displacement and power output, I think 750 CFM is probably reasonable. Seven hundred and fifty cubic feet per minute is a lot of air. Now consider that your tube is blowing pressurized air and water at your intake from just an inch away, while your intake sucks 750 CFM. I guarantee
it'll draw water in!
That's not to say you can't make this work, just not the way it is now. A gas (air) will move around corners much easier than a heavy liquid (water). That's why "wet" intake manifolds are so hard to design. So consider putting the filter in a box, then cutting some large tubing in half so it would act as a shield for the front of the filter but leave the back half open. The water hitting the shield won't be able to turn 90 degrees and enter the filter so it'll drop off, however the air can turn easily. If you sealed your ram air to the box the pressure in the box will likely be higher than just blowing the air at the filter anyway, so you may even net more HP with the shield/box intact. Just make sure to drill a small hole to allow the water to drain from the box.
Please bear in mind that I haven't tried to build this, it's just a thought to try to keep you out of trouble. I'm open to suggestions if anyone sees a fault in this.