Makes a lot of sense, and I was thinking along the same lines; needing a tune done to get the full bennies of the intake. I'm a big fan of modifications that eventually pay for themselves so I'm still considering it, but it seems rather pointless to just get the intake by itself.Eh. If you're looking for performance, it'll help. Just by itself, it won't do anything other than relieve throttle pressure. With a tune, it'll help push out some power.
Essentially a stock airbox is really quiet and there are tons of channels and walls inside them to muffle the sound and that creates a lot of pressure inside the box. Putting a straight tube which is typically any aftermarket will remove that pressure and help improve the flow of air. However, a tune will help the ECU accommodate that change and take full advantage of it.
The funny part is your air intake temperature will never be below the ambient temperature. If it's 75 degrees outside, your intake will never take in any air colder than that because there isn't any colder air to be found in your local atmosphere. A "cold air" intake really just keeps the intake temps closer to ambient than a stock box. A stock box could have temps 10-15 degrees above ambient and never get closer to the ambient temperature. An aftermarket can bring those down much closer to ambient so you're getting "colder" air. My Mustang and Taurus both are typically 3-5 degrees above ambient while driving.