[E-diction]

i want to install the stock sub so what do i really need to install it ? the stock double din headunit and stock amp or do i have a amp?

 

[Yoda E SC]

you can just add a small amp for the sub and the sub itself. no need to do the whole factory amp and radio thing, not worth it, get aftermarket if you are thinking of going that route.

http://www.elementownersclub.com/forums/showthread.php?t=58406

see the small amp i linked in this thread, it worked out for that owner.