I installed a subwoofer box fully loaded with 12" sub and amp inside the box! Sounds amazing! Not competition, but for everyday beats, it's a great deal.
My first sub install and it went very well. No wires showing inside the cabin, only in the trunk. Gonna get a short wire tubing to make it look cleaner inside the trunk. Only downside is it take up almost 2/3 of the trunk, and only fits in the middle of the tunk + 40lbs.
But it sounds AWESOME!!! The stock speakers aren't bad once you use it for a while, they're mellowing out and sounding pretty darn nice. When I first got the car, they sounded tinny, now it's hardly noticeable. Check out the DIY section for 'chri's subwoofer install' for help if anyone is interested.
http://www.ft86club.com/forums/showthread.php?t=23314
http://www.sonicelectronix.com/item_...11PECVR12.html