ive had my invader for 2+ years... paid about $468 shipped in a GB.
i live in florida and during the summer time it gets a little wet(daily afternoon thunderstorms)... id be more concerned with water building up by the reverse scoop(haha, i hate water spots). not a lot of water goes into the reverse scoop, unless you do your daily driving in reverse!! youll probably get more water into the raised scoop. either way, not too big of a deal.
i also have a CAI
, id be more worried about water coming up through the bottom of the engine bay rather than the reverse scoop.
so you should get it, awesome mod!!