This thread will get you started on the LAPower option:
https://rennlist.com/forums/cayenne-955-957-2003-2010/1099887-lapower-help-please-before-purchase.html
This is the option I’d recommend if:
1) You have PCM 2.1 (easily identified by the number pad to the left of the PCM screen) — it doesn’t work with PCM 3.0
2) You want to add USB, BT phone, and BT streaming
Once you get this working, it’s pretty solid and everything looks stock.
Here’s an epic thread on the Android head unit alternative:
https://rennlist.com/forums/cayenne-955-957-2003-2010/928770-9-android-radio-install-review.html
This option gives you a customizable, tablet-style headunit including the ability to run Android apps. Like many lower priced tablets, you need to be realistic about how many apps you want to run else it will stop being “snappy”. But there is lot’s of ability to customize and there’s a big support forum for the underlying hardware/firmware (but be warned, the Android forums can get pretty technical).
One other note, if you don’t have the factory backup cam, you can add/enable it on the factory PCM 2.1 (but it requires installing an [inexpensive] camera and having the dealer code the PCM). But if you get the Android unit, you don’t have to see the dealer — the headunit will support the camera (including the factory version).
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