Cold air intakes generally do little for horsepower and torque, they do add joyful extra droning noise which will add to your fascination on long trips.
They'll definitely give you a cold feeling in the wallet.
Your LX is now drawing outside air from under the right fender. That's about as cool as you'll find it. Anything with the intake under the hood will give you warm air heated by the engine. Finally, if you've got to oil the filter, that makes a pretty good mess. Over-oiling may be fatal to the MAF.
Finally, the 4.7 has been around forever. I don't think a cold intake manufacturer can come up with anything Toyota engineers and their computers have missed.