I have started to assemble my costly journey to adding this to my 981S with Bose. I have sourced a Radio, Connectors/Harnesses, Nav-TV Zen V and ordered a Match Up 10DSP., I have a PIWIS 3 clone and MIB2 Tool box as software to use. I will post my progress on this journey. I will outline my thoughts and challenges. Hopefully this will help others and me on this mod.

Software
1.My understanding I need to upgrade the software on the cluster. Will need to figure out how and what software patch I need. I think this is where PIWiS comes in. I have a clone of PIWIS 3 native installed on laptop.
2.MIB Toolbox will allow me to program radio too work. I think you can tell it which updates to perform. I am hoping to leave Bose function (amp function) intact. I want to make harnesses with no modifying of factory wires. I will be running new tweeter wires to have everything on separate channels.

1 have the USB Hub and cables. I have created the amp harness to connect to factory wiring Pending a harness from China to finish pcm4 to pcm 3.1 interface.