I made this box for my car and decided to offer it to the public. I am in the process of making these now. The price is $250 plus $30 shipping and handling. They come stuffed with polyfill, have a terminal cup installed with wires for the sub, and carpeted black.
The only option im offering is having the box built for either a 10" sub or and 8". There is no depth restrictions and the box is approx .6 cu ft internal volume. Its small but that the reason for the polyfill.
Right now there is a 3-4 week turnaround time. could be less but for now, im saying 3-4.
If you want one, PM me and il get you the payment details. I can accept paypal or matercard, visa, and discover.
Here are pics of it installed in my car:
here is the back of the sub and the area you need to cut in order for this to work. This is the only way is to cut. It really isnt that bad either, im sure the peice you cut out can be reattached if you ever sell the car.