Progress I made today on blauzed is that I changed out fasteners on my rear subwoofer enclosures so I could secure the new speakers securely into them:


and I finished my rear sunshade wiring harness by soldering in both ends with their proper connectors (one end to plug into the rear sunshade assembly and the other end to insert into the plug assembly for the center console switch module). All I have to do now is to remove the rear parcel shelf, make the hole for the rear sunshade then refinish the top with a fresh coat of black fabric spray and then reassemble everything. For me the easy part will be running the wiring from the back to the front center console.
Once the rear sunshade has been installed and secured I will then focus on replacing all the speakers inside blauzed with fresh ones. I have been told the BAVSOUND speakers I will be installing will need time to "break in" and then the sound will improve. I am looking forward to having fresh speakers including fresh subs in this car. Perhaps I might entertain finishing the stereo upgrade with the addition of the AVIN4 head unit but I'm still on the fence as I am not sure I want to lose the BlueBus functionality I now have . . .
I need someone who has done this and has the BlueBus interface tell me they have no issue using BlueBus with the AVIN4 head unit. This is the only thing holding me back from going forward with the AVIN4 setup.