What do audiophiles do in their cars?

I do some of my best listening in my car and since I buy good ones they last me quite a while.
It is worth the cost, time and effort for me to put a great aftermarket system in.
Using a Pioneer DEX P99 6-channel preamp only head unit CD player DAC with DSP and time alignment (retail $1300)
JL Audio 900 watt 5-channel amp and 600 watt 2-channel amp.
Focal 3-way components front and real with active channels and crossovers, custom install and door work.
Custom built Scan Speak Discovery 12" sealed subwoofer.
Took several years to tune the DSP for time alignment, speaker crossover frequencies and slopes and frequency response curve.
Sound stage is pinpoint, dynamics, volume and transparency are spectacular. Overall neutral full range sound with lots of music appropriate impact and slam. Love it.
Not for everyone because it took a lot of technical skill for the installation and tuning.  

Stock Mercedes Benz Bose. 
Listen to FM NPR.  For me, Hawaii Public Radio.  HPR1 and HPR2. 
I installed a sd/memory card module in place of the cd deck.  I only use it in pockets around the island where there is no FM reception.
Sound system influenced car purchase?  No.

I don't feel my car audio will ever come close to my home systems. I'm not going try.  I will certainly not put music on while driving, relax, close my eyes, listen, concentrating deeply into said music as I do at home.  I try to drive with open eyes, attentive, concentrating operating my motor vehicle. Which  I consider a destructive killing machine.  Not my recliner that gets me to the grocery store and post office.

Hello,
I had a HK system in the Mercedes. That was very nice. I have a basic Ford now with the Sync 1 system. With Tidal Connect it sounds really good. No more commuting to work so I don’t need anything special. My wife’s Honda CRV touring has nine speakers. It sound really great with Tidal app. A good source really helps. 

Threads like this one are always used by some members to brag about the cars they own.

Surprised how many folks on here seem dismissive of car audio. Sure it’s not your all analog 2-channel where Miles David literally appears in your listening room, but cruising and bumping the toons is a blast. 
An X5 I drive sounded so so, but I upgraded with the full Bavsound package, all drivers, woofers, amp and DSP, and it’s all tailored to the vehicle without customization and it rocks. 
Way back in the day I had a Mazda sedan with 2 18” JL W3s, Memphis Audio amps, and MP3 player, and JL components and it was all soundproofed. I had to get a second car battery, and oh do I miss those days. 
Can’t imagine loving music and shunning car audio. Can’t imagine many things these days.