HO, it depends on what kind of sound youre looking for... If you just want some good clean bass like Todd said then thats fine. But if youre like me and into hiphop rap and bass cds/test tones etc, 2 8s prolly wont do it for ya. Me, i have a brand new Jl 12w3v3 ported and its still not deep and loud enough for what i like so im getting a second one. Mind you, my entire back seat is covered with a box and you can hear me coming prolly 1/8th mile away, but then thats how i like it. Apparently, you are not wanting to lose the use of your rear seat, so my way wouoldnt work for you.You may be fine with just improving on the stock sub/amp, and the 2 8s will do just that for you! Good luck though!
Andy