What do audiophiles do in their cars?

XM Radio with whatever the best "optional radio with *** speakers is available. I think the Pacifica has Harmon Kardon 20 speakers and a sub, and my Corvettes always had a Bose system. And I must have the "optional biggest wheels and tires on whatever I buy. My wife has grown to accept that I will absolutely not buy a car without a Sunroof, great radio and nice wheels and tire package.. Always runs the price up on my automobiles, but why make payments on something I don’t want ..

The 14 speaker “Lexicon” in my Hyundai Genesis is remarkable to my ears, depending on the source, of course.

Have an Infiniti with one of those run-of-the-mill Bose systems with cardboard speakers and a horrible sub. Kept the stock head unit, speakers upgraded where easily accessible (to match the amp had to find 2ohm high sensitivity speakers). Replaced spare-tire sub with better spare-tire sub. Dynamatted all the doors and floors. Maybe $1,000 and some of my time for the work? Marked improvement, but as others have said, hardly a controlled listening environment. 

I use to listen to my wife but Dekay’s wife’s complaining is more interesting-as always, stuck in LA traffic

I use the stock system in my VW GLI and stream Qobuz or the Relisten app from my phone.