I can't tell you exactly what it's like yet, but I can tell you what I am doing. I am putting in bucket seats from an '84 Toyota Pickup. Behind them will be a custom box holding two 10" JL Audio 10W6AE (the older ones which only needs like .625ft^3 of air space) behind each seat, in the center will be my two crossfire amps (vr602 for subs, vr302 for mids), the mids will be some Focal components (can't remember what model off hand, some K2P's or something), and I have a Clarion headunit and equalizer. I also have $300 dollars worth of sounddeadening and closed cell foam from Second Skin. So yeah, should be a vast improvement over the five year old Sony headunit and the 4" MB Quarts that my buddy gave me.

If I didn't already have like everything to do my system, I would probably get one, or two, of the Alpine Powered LAT Subwoofer Sustems. Kinda like the Kenwood WOOX, only much much better. Heres the link, check em out:
http://www.alpine-usa.com/US-en/prod...p?category=SUB