Below taken from Connects 2 webiste....So in answer to you both, Yes! It plugs into the CD changer port in the back of the HU therefore disabling the use of the changer but still alows use of the single cd on the head unit.
•This interface is suitable for Alfa Romeo models that utilise Blaupunkt CD changers (models CDC-A08, CDC-A03, CDC-I09). Connection is made via the 8 pin miniISO connector designated for CD changer control on the back of the head unit.
•Supported vehicles include 147 when equipped with the Blaupunkt 937 Mid or 937 High head unit, 156 when equipped with the Blaupunkt 156 Mid or 156 High head unit. Connect navigation is not a currently supported application.
•Alfa Romeo 156 2000 >
•Alfa Romeo 147 2000 >
•Alfa Romeo GT
•iPhone / iPod COMPATIBILITY:
•Will work & charge all current iPhone's including iPhone 4 / iPods / iTouch including iPod Nano