I just don't get it. A car is basically a fairly lousy place to listen to music. Even a very quiet car has a noise floor of ~60db and a lot of high frequency wind and road noise which is part of that.
Nothing against Sony car audio, I had Sony Mobile ES stuff in my system for 15 years or so and it was great. Once I got an iPod and ran out of options with the head unit, I got a Kenwood Excelon head unit which integrated quite nicely with an iPod. But could I hear a difference between 256Kbps AAC and CD in a car? No way. OTOH, if had had the scratch....