I had a Chrysler LHS with the same problem. Instead of some crazy "Pimp My Ride" idea, I simply replaced the back stock 6x9's with kicker 6.5 inch round speakers. i simply used a small strip of metal to hold it in place. Plus the speaker grills, covered up my little secret. I still had a good rear fill and a lot more bass came through from the trunk. I hope this helps. Good Luck