The green thing turns out to be a fuse - finally got mine pulled down to look at it closer. I do not see any special optical or otherwise unique inputs to this amp. Since the wiring is basically your normal car wiring, I think swapping amps is at least possible but needs more research.
So, care to say what forum or post a link? I just want to be totally sure that the pin assignments are what they are and are not different between Z4 models. It's makes sense that the harness would be the same between models but I don't want to start tapping wires and find out different.
Which are the HU inputs to the amp? Are they the "E signal,AF radio..." pins? If so, I'd think there would be 8 of them, a positive and negative for each channel, and there are only 7 in the above list.
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