Currently have a CarPC in my 330 (2001). Been working well with CarX. Only thing that I have done with it is upgrade the PS. Still have a tank battery connected though. The PC is connected to a Video module which I purchased a few years ago and using the Ibus interface from Resler. I mapped out the NAV radio controls for AUX and is working well. (haven't played with it in a while). PC is a mini-itx. Plays MP3's and videos (DiVx) with no jitter. I like CarX in that its a no frills basic interface which works well with the ITX board. I can post my INI file if anyone is interested. I have it currently set up to come up with AUX mode. Currently working on a CarPC for my X3. Finished the PC part. Ended up purchasing two. One very small footprint MiniPC (6"X6" size) and a larger setup in a VoomPC2 enclosure. Both of these are higher HP PC's with larger HD's/dual core CPU's. Did the basics on the X3 (already has NAV). Used a 3rd party video module and tapped it into the NAV video. Picture quality is nice. Finished the AUX port installation. My next step is to get the AUX audio to the rear of the vehicle. Thinking of using the CD-Changer cables for this doing a pin for pin from the front of the vehicle to the center console then to the rear of the vehicle. Its only three wires and I don't have to rip the car apart to pass the wires to the rear of the vehicle. Will post a picture of the 330XI setup.

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1