TerminatorX5,

I just Got my 4.8IS about 2 Weeks ago. I will answer your Questions:

1.CD Changer Never Played, Shows up on the Screen ( CD1, Track 1, Etc).

2. Haven't done any work in the Boot

3. My 2 other E53's do not have DSP, Thus no Coaxial connection beteween CD unit (N22) and Amp. I did however they the one out of my 2006, and plugged in the 3 Pin Connector and the 6 Pin connector, But no sound what so ever ( Not even the TICKING noise)

4. Yes, I am very good with a wrench and other Electronic things...

My CD Changer is the AI type verses the Normal type.

Any other Thoughts would be appreciated.