Here is a pic of where the back seat used to be. Custom sub woofer box had about 80 parts, 12 cubic feet divided in quarters so each sub had exactly 2 cubic feet. To get the box into the car, I had to remove the right door. The floor was also lowered to get the box to be the right size. It was important that the box was not built too high. Did not want anything blocking my vision.
This was also the first car I used a wink mirror on. Had 8 mirrors total for 360 degree visability without turning my head. Still use these set up to this day on subsequent cars. 4 of the amps where built into the rear footwell area and lockable and fan cooled. The rest were in the trunk. This was before big stereos were 'getto'. Back then this audio stuff was very pricey. I remember the amplifiers alone were worth around 4 grand back then. This stuff is much cheaper now.
What an experience this car was. Hard to comprehend unless you rode in it and heard it. Great memories.