I would like to do this as well. I have a 2006 ranger with the Pioneer 6 disc mp3 changer, and of course I haven't used MP3's in like 5+ years. I found some of my old CD's that I had burned MP3s onto (for a Sony MP3CD Walkman) and promptly got them stuck in the player (cause they had stick on labels with the contents). I have thought about borrowing my old PC back from my little brother (that had a tray-load CDROM) so I could copy the CD's back to HDD and re-burn them to new CD's without labels, but I'd rather just plumb an iPod directly in. I have heard bad things about using FM modulators (maybe FM doesn't have enough frequency range, don't know??). I know that my current stereo does not have an "AUX" button, which means I want one with an AUX button, but don't want to go replacing a bunch of stuff. How/Where did you find the 2007+ replacement system? and how have you gotten along on the install process?
TIA,
Tommy