Personally, I think the cold air intake is the "cow magnet" idea of the decade.
Not only do they give almost no gain at all power wise, they do n't filter very well either which lets dust, water, and plain old dirt right into the intake.
They're a joke, and a very expensive joke at that.
Bobistheoilguy did a nice un-scientific study on them that finished helping me make up mind. Go check it out.
http://www.bobistheoilguy.com/airfilter/airtest1.htm