one thing to note is something I learned today. I bought an MKIV from Holland. I think the computer came out of a 3-series. Some European 3-series cars have a small monochrome nav display instead of the color displays that we have in the US. If you get an MKIV that is meant for the monochrome display, it will not work with a color nav screen. The only way to know for sure which computer it is is by knowing what nav it came from. I hope this all makes sense and is accurate.

...josh