I'm going to put in a 5x8x18 which is 720ci volume-wise and is more than 40% bigger than your 14385 which is only 504ci. I assume the extra volume will muffle better. At least I hope it does. If you're willing to wait a few weeks, I can let you know how mine turns out.
Last edited by kenmar; 04-30-2010 at 12:22 AM.