the factory BMW Ipod adapter when installed leaves a lead in ur glovebox which charges the ipod and also interfaces it with the factory audio system. It will emulate a cd changer and play thru the deck displaying like 1-1 for playlist 1 track 1. It does not display the cd text.
As far as the installation goes it is a advanced installation involving pin removal of the factory radio connectors so unless you are an advanced do it tyourselfer then a professional installation is probably for the best.
hope this helps,
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