2002 C4S navigation/bluetooth options?

[aoua]

The 2002 C4S has the bose/CD sound system and I would like to upgrade to a navigation system with bluetooth etc...

What options exist?

Any plug and play devices using the porsche harness?

I would prefer not to go with a lighter plug-in unit (like garmin, Magellan etc...)

Any help would be appreciated.

Thanks

Andreas