Is your car the system that produces the most bass out of all the other devices you listened to? If that’s the case then it’s telling you something if off with your bass.

Less sub. Bass doesn’t need to be insanely loud but rather have its own space in the mix. Do a low end cut around 50-80hz. If that doesn’t work try taking out bass in the other instruments that may not need the low end under 100hz. Such as snares or the melody