There are about 4 manufactures that actually have a slim mount subwoofer BUT all subs are not built the same.
These boxes are designed SPECIFICALLY for these cars not a box that you just assemble and throw in the back of the trunk, also the other advantage is the weight savings of our "slim mount" woofer, along with a fiberglass enclosure.
You may be saying what is the advantage of our particular driver over the competition? Well first of all we are an engineering company first and a performance company second.
What I mean by that is our slim mount woofer does not have a "conventional" design, during development we found that the slim mount woofers performance was being hindered by the spider, limiting the excursion of the driver, thus limiting the bass output as well as the low end extension.
Our driver has a spider-less design with our own surround design, this gave us the ability of having a slim mount woofer with the performance of a conventional sub woofer, also our design regarding magnet structure is different, we went with a hybrid design instead of a conventional magnet.
We fused a smaller conventional magnet together with a neodymium, this did 2 thing s for us, we were able to keep the weight down again, but we increased the BL factor by using a neodymium magnet which has a much stronger pulling force which helps keep the voice coil within the "BL factor", which in turn gives you better control of the sub woofer (or dampening).
We have not set a price yet but we are trying to keep a low cost without sacrificing quality and sound the company is called RE Audio
www.reaudio.com we have been engineering speakers for about 9 years now and we are VERY dominant on the SPL scene.
www.reaudio.com is the website