I got a c250 loner this week and it's audio connectivity is a lot better than my 08. The bluetooth pairing & streaming is awesome & so it the telephone address book sync. The BT music resumes playing when i enter the car, i love it!

The question i have is, how can i retrofit these features into my 2008 model?

I have a 2000 C300, and would like to add this feature as well, they gave me a loaner and the BT connectivity is great on 2012 models.

Unfortunatly you can't. I tried to get it done on my 2011 at the B service and was told it was not backward compatable.

You can. You just need a after market system (navi system)that supports a2dp. There are some post in this forum talking about it