so, i am planning to put 2 subs in my Explorer. This is my first time doing anything to my car.

About the enclosure...
Does it need to be vented, or is sealed OK??
here are the subs i am planning to get. and im searching for a box. Do i need sealed or vented???

Also, any other sub suggestions welcome...
Ibanez RG42DX
Peavey Valveking100
Avatar 4x12 cabinet w/ Celestion Vintage 30's
Line 6 Spider 3
DOD Flanger
Ernie Ball Strings
Dean Edge 4
Peavey TNT 135
GHS Strings