What ipod conection do you have ?
One that lets you run your ipod with your stearing wheel, and displays song names etc. on your stereo.
Or the one that lets you get the sound trough AUX input ?

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005