Which car is best suited for a system?

Hello Since I’m about to buy a new car, I’m going to take my system into account. I’d like to hear your experiences with different cars. For example, with my current (Mazda 626 5tr) it’s relatively difficult to get a proper bass. I don’t know if it’s due to the big trunk, or generally to the big vehicle. Furthermore, the storage is hard to make from MDF. The stupid thing is that the storage in vertical and horizontal a curve-shaped course h At the back and at the front there is only room for 10cm speakers. In any case not exactly suitable for the system, the car. In contrast to this e.g. a 3 gulf. Even with smaller woofers you can get a proper level. The hat rack is easy to build from MDF. At the front in the doors I think 16er can be accommodated. With the door speakers you have to put in a lot of work, so that that sounds also. Golf III at the moment my favourite. hte very grateful…. greets pipeline