i assume you spend a lot of time solo in your vehicle? My own car is these days more of a commuter, run to Bunnings on weekends etc, so i'm not fussed on the stereo quality. I did have a cool amp and speakers in an old commodore >20 years ago (my first car), but when my neighbor's deadbeat boyfriend stole it all, i stopped spending money on stuff like that. Maybe, living in Marrickville, I got what i deserved...
Most modern cars have pretty decent systems for the average driving around days tbh. missus euro suv has one with those Bang and whatsisname speakers, and usually the kids are in that car with me, so probably best not to deafen them