Replace PCM-1 with CDR-22?

[fridsten]

Hi,

I have a -99 Boxster with a PCM1 unit. It has the lot. Navigation, phone, CD changer. Naturally I want to replace it. The navigation can't be updated and I won't ever use the phone.

I have a holder for my mobile, on which I've installed Copilot GPS with maps of all of Europe, so that's more than enough. I don't want a 2-DIN unit with DVD, USB, GPS and so on, but just a simple, easy-to-use radio unit, with RDS. If I can keep the CD changer, that's a bonus. A 1-DIN unit also means that it's possible to move the climate control unit up a bit, so I don't have to peek down in front of the gear lever in order to change the temperature.

Right now I'm thinking about getting a second hand CDR-22 unit. I would like to find a guide or a howto, but Google is of little help.

Any thoughts? Advice?

Edit: The relevant option codes for my car are 490 (Mj 01 Sound System), 662 (Info/Navigation System), 663 (Hands-Free Receiver) and 692 (CD-Changer Porsche),