so its gonna be a box like the first picture or a FWI, how would I goes about preventing hydrolock?

if I had a FWI i would have hydrolocked this week, had water up past most of my wheel. Its a risk, I would go with the CAI but its your decision.

I checked on Allmachtige'* cardomain page it looks like he removed the charcol canister put a 3.5 inch pipe thru the hole and cut a hole in the lower part of the front bumper? but what I can't figure out is what he covered the hole with??

He didnt cut a hole there, it'* a natural part of the fender. I don't remember what he used but he got it at a home improvement store(some sort of plastic).