[quote=MrX30si]Do you have to replace the CD/Radio unit with the CID radio unit?


Yes - you need the extra right-hand knob to control the nav and the other buttons for switching between radio and nav etc

Either CID/cd or CID/mini disk. Z4 shares same part so lots available on ebay. Pop-up screen for Z4 and X3 are different having different mounting so make sure you get the X3 version


Where can you get the TIS CD?

ebay