[crisis]

It is possible , and indeed neccessary to employ a subwoofer in a car to achieve a decent level of bass without it sounding like a mobile rave. Because of the size of a cars cabin it makes it impossible to reproduce accurate deep bass as the waves are longer (like 30 ft or so) than the length of the car. Therefore by accentuating the deepest signal that you can reproduce can give the impression of deep bass. So in reality your "sub" which may be capable of reproducing 40hz or so in the correct enlcosure can do no such thing in a car. Technically it is not a subwoofer as they are generally used to reproduce frequencies below 40hz.
So, I a 41 year old dinosaur, run a sub in my car but adjust it so I canhear the rest of the frequencies as well. A novel approach.