On my brother in laws Falcon - he set up a CD/MP3 in the glove box and used a "signal repeater" with the remote to operate it. Most of the stereo remotes will not work through a steel glovebox door, so the repeater mounts under the dash, its a small little "eye" and you point your remote at that. The repeater has a transmitter that flashes the infrared signal at the stereo which is wired in to mount inside the glove box. You would never know the system was installed and it only cost about $20 to wire it in.
