You can't have a proper soundstage in a car no matter your setup, which kinda degrades a lot of music that wasn't designed for clubs. In a car it's basically background music when you're driving because you can't really give the music your full attention anyway (passive listening), where the lack of focus also masks a lot of details you'd hear on a proper stereo system (active listening).

Edit: to answer your question below, I like both, active and passive listening. But I wouldn't try to optimize for active criteria like details in a passive evironment like a car, so I'd spend more money on fun things like buttkickers instead of high end detail.