2 15'' L7's with a ZX2500.1. Spend the rest of the money on the necessary electrical upgrades (H.O Alt, battery(s), lots of knukonceptz zero gauge.) Then contact JBLcamry and have him design you a box, take that design to Bjfish11 and let him build it. After that your friend is going to have a louder sub stage than he knows what to do with.he's got aftermarket speakers...they just cheap one's thow....Sony xplods, but he's got 4 of them with 4 tweeters, and he prolly dont feel like upgrading those
I would highly recommend upgrading the front stage, even if it's something small like this;
http://cgi.ebay.com/PHOENIX-GOLD-RSd-65cs-6-1-2-COMPONENT-SPEAKERS-RSd65cs_W0QQitemZ170187021057QQihZ007QQcategoryZ32819QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
paired with this
http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=3949
