this doesnt really affect you directly, probably, because of the change in body style, but the trunk should still be somewhat similar right? nothing super special fancy, just a home-made setup with some mdf, carpeting, and some leds:
2 infinity 10" in a ported enclosure with separate cooling fans (wired to run whenever the ignition is on) for the rear mounted amp with a flush mount front facia to clean it all up:
Trunk 1.jpg
At night with the leds lighting the ports, fans, etc. wired into the trunk area light so theyre only on when the trunk is open. notice the

in the lower corners...
Trunk at night.jpg
Quick shot of the amp (cheapo 2 channel, 480/1000 per channel) from inside the car with the rear seat folded down, it's shifted back a bit, so there's more of a gap than there should be on the right side, but you should get the point:
Amp 1.jpg