Most car sound solutions have been a grand disappointment for me, even with a high price tag. Too high of a noise floor and too many acoustic compromises. When I want to REALLY listen to music I use these, mostly on long highway trips or airplanes. No, I don't give a rats azz if cops don't feel comfortable with me wearing them on the road.
These are the newer versions of the ones I own which I have used for 10+ years.
https://www.amazon.com/Shure-SE215-CL-Isolating-Earphones-MicroDriver/dp/B004PO10E2