I love how tame this forum is. You can go against the audio grain and people don't chew you up.
I once argued with a guy on Acurazine who was running four 15" subs in the back of his Acura RL (underpowered luxury sedan) off 2000 watts I believe he said... I told him that you the reason he destroyed his trunk was because he was only firing into the trunk, not the cabin. He essentially refused to believe that, and simply believe that the car can't handle any "real" sub setup...
No car can handle that kind of power in the boot. The tunk lid is designed to be held down by two hinges in the front and one latch at the back against a rubber seal. Last I checked, a proper enclosure doesn't open when you apply too much power.