Which Intake?!!

[Jimmy Pop]

hi again guys, thanks for all the help. this time im in a delimma on what
kind of intake i should get, its gonna be the first go fast goody i get. i
know hotshot makes one, and hks has the supermegaflow for it, or at least
nopi thinks so. what should i get? and it says i have to get a smaller
bettery or whatever, so what should i do ? also, what size of speakers are
in the back of my nx2000? the stock ones by the rear seat( if it is a seat,
lol) i need some new speakers, im gonna put an eclipse head unit and
hopefully some eclipse full range speakers in it. please help!! thanks alot
guys, i appreciate the help before!!