Can second the fact that the thread linked above has everything you need to know, probably a lot more too. Most folks either do Eton front / JL rear or Bavsound at least as far as speakers go. After that you get into the netherworld of crazy $ for car audio that never made sense to me since, um, it's a car with LOTS of challenges for a listening environment.
You'll be quite pleased with just a speaker swap and upgrading your source material to FLAC, easiest route there is a FiiO to aux in. The audio conversion process in the head unit is not great.
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2022 Macan S
2016 F31 328i xDrive Sport Wagon
2006 E46 330ci ZHP Convertible
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