I threw two kicker Q 12s in the back with an 1800w amp stealth mounted in the side wall. Perfect stealth setup that bumps HARD even with the top off. And because it bolts in, its a bit more secure than just a box sitting on the floor. Build quality is excellent. Only gripe is it does come a little too close to the placebo clip for the rear washer motor. Mine got smashed a little, but that's okay. Worth the trade off.