Posted the following in another thread this morning. Sorry I tried a straight copy and paste but the links didn't work.
http://www.mini2.com/forum/3358718-post3.html
Now I know that you are saying yours is an early type Boost CD without the AUX input at the back. But I think that you can use the CD changer socket as AUX on the early HUs. Sure that's what Mikey told me, but best check.
What you won't get with an early (pre 05) CD is the scrolling titles on the Gateway 100/300. Unless you know a friendly MINI2er with a very late Boost HU they can let you have
