Over here in Europe you can get the new A4 without factory installed stereo. I ordered mine this way as the cheapest system they offer is the Concert II with Bose (impossible to get it without Bose) costs about $ 1500. When ordering it without you automatically get an 8 speaker pre stereo kit.

As I just wanted the concert II without Bose I bought the concert II unit in Germany. My question is will it work with this pre stereo kit? And do I need the rear speaker amplifier as there are only 8 speakers instead of the 10 you get if order it with the Bose system...