CAI intake that's actually COLD air?

Looking to maybe add a CAI kit to my 2000 4x4 4L in a desperate attempt to improve mileage as much as anything. But I just see kits that keep the filter totally up in the engine bay. Can you buy a kit that actually intakes COLD air?

Forgive me for sounding retarded, I've always had performance cars. My GN does have true CAI with an ancient ram air setup.

you could use your stock intake box? this is true cold air?