It’s not worth it to me to improve on our car’s sound system because the stock one is fully integrated into the dash, and there’s no DIN slot to replace the head unit. It hurts to listen to music in the car, so it’s either podcasts or nothing for me. And usually, it’s nothing…
Besides, for my tastes, you can’t make a car sound good enough for me to invest much in the way of audio improvement. Maybe a head unit, some reasonably priced replacement speakers, and a small sub would be plenty (and maybe overkill) for me in a car