Well it’s not a Monte Carlo it’s full size so the trunk is fairly deep between 15-19″ depending front to back. I have two Alpine Type rs in a sealed box with the amps sitting on top of the box and there is room to spare! One reason people love B Bodies (caprice ,Impala etc) is there roomy trunks and Wheel wells. The type Rs are ok but eh even with a
800w they aren’t all that. I want bass like when I built a dual 15″ house sub with a 500w
plate amp now that was earth shaking!
Anyway the infinite baffle is doable and probably would be have better response then
the sealed 12s do. I know an infinite baffle reduces interference in the drivers resonant frequency response and in my past experiments has sounded better to me. However in a true IB the driver is on a baffle infinitely wide and tall, so the only way to do it is separate the trunk from the cabin and put the subs in between is that what you mean?
My rear tray can actually fit 12s but I have concerns about blowing the window out lol.
My window is not normal glass it a 3pc window glued together that maybe just a tad paranoid though.