^ +1, I was going to suggest some silicone as well, and if you ever have to remove it, easy to get off. And dub said caulk, giggity. I've had alot of "ram air" hood on different vehicles and never had a problem with water getting in, shoot, the 98-02' WS6 trans am's had the ram air hood with air-box setup RIGHT behind the scoop, no issues there either. I think some people worry a little too much about the amount of water that actually makes it to the air box. Mustang looks good BTW