Grab a bass tube itll add the bass your looking for and allow you to keep your space in the back and not cost alot. Their easy to hook up to. If you really care for a good system get a custom box for the wheel well or go all out like I did and get a custom box for the whole rear well. 10's in a properley tuned box will POUND and still sound very crisp. 12"s will sound alot louder and slam harder but takes away from the quality.
I have a custom box for 2 15"s with a plate on top that allows me to use my 10's. I use the 15"s when I want to hurt peoples ears, o and im only using a 200 watt 2 channel bridged amp!

i just made a box for one 10 inch sub, fits in the small little well in the back so theres a little room above it, took me maybe 2 hours and i have a 700 watt sub and 500 watt bridged amp and it makes my entire car rattle and i have another amp and the panel for the two twelves that i can still put above it if i wanna.

^^^ you should have a bigger amp on that sub if those are rms ratings. id go 800 or 900

rms for the sub is 350 bur i have the bass on negative 4- negative 6 and it makes the car rattle lol. i paid 30 for sub like a year ago, 25 for amp like 2 months ago and box was prolly 10 bucks from leftover wood lol

nice.. was just suggesting you go over cause you dont want to clip the woofers or youll be blowing up something ;).. i had an old pair of visoniks laying around so i plugged them into an outlet in my house :D they blew in about 2 seconds and were smoking.. it was cool, shoulda video taped it.

did that with 6x9s lol

hahah nice i thought it was awesome.. except it smelt like poo