Bought my car today!!

[dghii]

You can replace the radio with with a double DIN, just understand that you will also be replacing the amp.

If you just want to add BT for audio streaming and hands free calling. Google the iSimple Tranzit Blu. It's about $80 and will work with the Bose system (or any other radio). It connects through the antenna so no over the air FM modulation issues.

I bought this system for an 03S a few years back but sold the car prior to installing. Last summer I stuck it in a 2002 4Runner and it works great. It pairs quickly upon starting the car and the hands free is very clear. Audio streaming is basically FM quality as far as stereo separation and dynamic range are concerned.....not CD quality but certainly listenable.