What do audiophiles do in their cars?

Generally, I listen to the sound of the V8 engine while driving twisty mountain roads. But seriously, a car is a poor place to put a high dollar system unless you are sitting still with the engine turned off.. Too much noise and too many cars on the road which demand attention.. So listening in the car is a casual thing. My listening chair at home has no such demands.  Cars now have decent systems. Wife's Avalon has a pretty good sounding JBL system. The older cars didn't have very good ones so I always changed out the stereo. Many people did the same. 

+1

a sports car should have its own soundtrack - i have gone so far as removing all stereo head units, amps and speakers from my air cooled porsches to reduce weight (as well as some sound deadening), i never turn it on anyways

a cruiser/grand tourer should be quiet enough to have a decent stereo - meaning it doesn’t make playing driving music sound harsh, tinny or otherwise offensive - you can’t hold a car stereo to any standard similar to a proper home system - the key is the car being quiet enough so the sound system runs at moderate volumes and isn’t blaring and making harsh noises

Have Mark Levinson system and 8 track as well.

In the car I listen to the iPod. In the 911 I drive.

I listen to sirius xm, which has poor sound quality. My oem stereo is not good and neither is the road noise. The setbacks of upgrading the stereo like removing panels is not worth it to me. The other problem is integrating a better stereo with the stock "infotainment" systems. In the heyday of car audio there were only like three options for a really good head unit. I would be surprised if that kind of sound is available today, but I do not know for sure.