I havent cut the walls off of my stock airbox yet and mine just lays in there. Im still using the stock accordian tubing, so it curves over the wall of the airbox. It is very close to the hood though. As far as the Outerwares goes, I dont know if it keeps water out, but it sure does keep dust out. I was under the hood the other day, and my black outerwares was orange.....had a fine dust all over it. So, I guess its doing what its supposed to do.