TigerFan20

Hey guys, I'm new to this site. I'm about to buy an RL-P 12, but I'm not sure whether to get the D4 or the D2. What's the difference? Does my car have anything to do with it? If it does, I drive a 2000 Toyota Camry. Also, the amplifier that was recommended to me is this one = Audiobahn A8000T, is that a good choice? Also, I need a box for it, what would be a good box to get? Is it hard to build one? Thanks a lot guys, Chris