Be careful with used equipment, the person that used it before you could have ran it at max or mistreated it? just do a simple amp and sub combo, if you dont want something up there made for competition, you could always hit walmart and get your amp kit, subs, amp(s), and boxes =) or just go to an electronics store that sells car audio, you can usually find a good deal or to if ya shop around first, are you looking for insane bass or just something that will give you just a little extra bass?