I would first spend some time and money reducing the cabin's ambient NOISE level below the typical ~70+ db level before I invest any money in an upscale audio system. Otherwise the only way to really appreciate a good high fidelity system is in a nice quiet garage with the windows up, the engine and HVAC blower off.
Are you might have someone design a music/sound content pre-processing system, DSP, to automatically raise the system sound content that would otherwise be below 70 db up above that level.
I've never thought about noise reduction but that's a really interesting idea. Can you you point me to any websites that talk about that sort of thing because I don't know anything about it. Same goes for DSP pre-processing system. Could it be hooked up inline with the factory radio? The fact that it integrates with the Navigation screen and radio display below it seems to complicate matters - at least to me. Does anyone know what types of input/output ports are available on the factory audio system?