K, i think i got everything.
I just purchased a
JL Audio 12w6v2
JL Audio 500/1v1
Hi-lo converter
Rockford Fosgate 4gauge amp kit.
Im going to attempt the install my self using the DIY guide sticky.
This is going to be installed in a G35 2006 Coupe. Im keeping factory HU.

Im just wondering is that everything or am i missing something? Will post pics up soon!

 

What kind of enclosure?

 

I would also upgrade the stock speakers while you're at it. <object width="0" height="0">
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^^^

If that's done then a 4 channel amp will be needed. Not necessarily "needed", but highly recommended, otherwise difference will be minimal.