Subs in a enclosure are out of the picture right now. I'm not looking for a front stage that will provide the full sound system effect. Just a good sound that is to be expected from a front stage. I'm not too concern with the low end right now.
However I am still considering actually putting some nice 6.5 subs in the back door. I can't even tell the factory speakers are there now because of the factory front stage, so why not just put the subs there. I got a Galant and a Tahoe as well so I plan to keep my Titan nice and simple.