Thanks for the fast reply Brian. To give you a little more insight into the setup I am going to pipe the output from the aftermarket radio into the aux input of the Business CD. I have already tested this and it sounds pretty good. So, for now, I do need to keep the CD.

Anyone know of a document that diagrams the wiring? Why is that BMW does not offer a Service Manual like other auto makers?

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[Sold] 2004 X5 4.4i - Sterling Gray - Truffle Brown, Sport, Preminum, Rear Climate, DSP, Sirius, PDC, 132's (19 inch wheel), Comfort Seats
Dynavin, JL Audio Stealthbox, Alpine PDX-5 Amp