Ok, this is going to be my first setup, and im not big on doing anything normal, i want stuff that makes people go WOW. So im deciding to get a Btl 18. At first i thought about 2, but have about 1200-1600$ to spend atm and figured 1 is fine. so i have quite a few questions as this being my first build. Im probably going to put this in my back seat. I have a 2001 grand am 2 door and figure i can remove the seat and do a nice rear seat/ trunk box for room. and so i can still use my trunk. 1. whats the difference between dual 1 or dual 2 ohm. 2. Is a Hifonics bxi2008d good enough to power my 1 Btl? if u recomend a better amp for about same price please let me know. 3. how much cubic feet should i make the box, and ported or not? any diagrams of good boxes would be appreciated. 4. Should i really upgrade my eletrical? ive herd a few options around school. adding a battery, using a few caps, or a new alternator. which would be best, and then which would be ok/cheapest. more questions to come im sure