CircuitGuy,
The nav unit is the factory one that comes in the 2004. The adapter is the soundgate one. You can get that at
www.logjamelectronics.com it is cheapest there. The cd changer is the cdxp-1280 from pioneer. That is the only parts I needed. The XM module is coming for Christmas. I love it a lot. Espicially because the steering wheel controls are still functional with this setup. Hope this helps. Let me know if you need any more info.
DVJ,
I am pretty sure you can.
www.soundgate.com is where I got the adapter and they will be able to answer all your technical questions about that. Hope that helps.
Craig
04 Pewter H2- Lux,nav, air suspension