Welcome!!
OK, here's shortened version...
1. Put the DSP Amp back in.
2. Install H/U and run 6m loom from H/U to old radio connector in trunk.
3. Purchase iBus adapter and iBus app to enable operation of new H/U with factory DSP amp.
4. See what sound you get and work from there.
Good Luck!
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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
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