whatever you decide, get a sealed box for "clean" bass. a ported box will be louder and boomier. check out crutchfield to see what sizes your current factory speakers are. you will need a minimum of HU, wiring kit, 2 amps min (4 channel and mono) 1/2 subs, front and rear speakers, speaker wire. a budget would also help out to get a system together. post some more info and perhaps, the board can steer you in the right direction....