Everyone, im just about done modding the outside of my 05 super crew truck, and want to upgrade my sound system.

Im reasonably happy with the clarity of the stock system, but i want some nice deep bass to add to it.

Im not looking for earth shattering bass, but would like enough to give a nice back massage (lol) or at least compliment the system when it is up high.

Ive looked at various under the rear boxes and cant decide...ive been out the speaker scene for a long time (ten years) so i dont really know what im looking for.. i need ideas, pictures, specs, and prices of what yall done to yalls super crew.

Is it possible to keep my factory head unit and still run the system i want? Thanks in advance