I purchased the Kenwood KOS-A200 and installed it in my '06 Zephyr. I have the THX II system and don't want to change the HU. This unit is great. It does a great job of taking advantage of RDS to display KOS-A200 source, menus, etc. It includes a remote control. The sound quality is better than any FM modulator I've heard. I also installed the Kenwood IPOD adapter. I've seen better IPOD controls but it is very usable. Installation was easy. I'll try to get some pics sometime this week. I'd recommend this to anyone who wants to keep their stock HU but would like a little more add-on flexibility. It would be rather useless without RDS on the HU though.