G'Day Overboost,
New X5 owner here having just purchased a4.8is in Le mans blue. Somebody has royally borked up the whole DSP system in my car (Nav works, speakers have some crackle, no audio from the cd changer yet I can control it all just fine, TV module appears and disappears, no reception, tape deck throws an error when inserting a tape, front screen sometimes flickers) so I'm wondering if you have a build thread or any informatrion on how you upgraded your sound system?
Beautiful example you have there BTW, I hope I can get mine running and looking as nicely as yours.
Cheers from Australia,