A slim subwoofer is going to be able to provide you with the benefits of a normal subwoofer without the hassle of finding room for it. A lot of people that want a subwoofer do not have a place to put one in their vehicle. The slim versions of subwoofers will allow you to be able to position one in just about any vehicle.
Slim subwoofer performance is something that is often critiqued. Many people assume that these subwoofers are not going to be able to provide you with the same type of performance. This is something that can be both true and false. If you happen to be working with a slim subwoofer of poor quality, then no, you will not get the same type of sound. Most vehicles don’t need a ton of power, and a decent slim subwoofer will be able to handle 400 watts with an 800 peak with no hesitation or distortion. If you end up purchasing one with less than this, you may end up suffering quality.
A lot of the performance will have to do with the slim subwoofer enclosure. The location that you have it in is going to have a lot to do with how it sounds. You will need to make sure that you have the slim subwoofer in a location that is going to allow it to provide bass, without disturbing the enclosure.