I really appreciate it bass-aholic. Same to everyone else who posted.
The only thing more frustrating than having this stuff not work like I want it to is not getting any help with it.
I'll try messing with my sub's position tomorrow, and just for the hell of it I'll try some 8ga speaker wire that my brother has left over.
Once I can get the money aside I'll look into getting a roll of rammatt for my car. Hopefully before fall since the winters here make it impossible to do anything car related for about 6 months out of the year.
I'll also keep my eyes open for a nice box that fits those specs, just in case.
Also, I was just thinking about it and I don't think a ported box would take up too much more room if I could mount my amps onto it since I'm using a small wooden amp rack (I built it out of MDF) to hold my amps right now.
A ported box will be louder, but the problem is its still not really a solution to the problem. Its like if you were to buy another sub and have two sealed, and then you'd be louder, but you still aren't getting what you should be out of them.
Sound deadening will not cause you to be much louder if you aren't already loud enough to be flexing trunk/doors/roof/etc. Sound deadening stops sound from escaping, but if its not powerful enough to be escaping in the first place, sound deadener will mostly just make your car sound better in terms of the quality.
I gaurantee you that 12gauge speaker wire is plenty, unless its like...really crappy 12 gauge which is acting more like 18 or 22 gauge or something...
Bottomline is you haven't found the right spot for bass to originate in your car. It may seem like you have tried everything, but seriously try again. Sub should definitely be in the trunk, if there is no opening at all to the cabin from the trunk other than folding the seats down, you should consider always having your seats folded down, or figuring out a way to create more air flow through your rear deck. On my rear deck, I had grilles from where the stock rear speakers used to be. This was on my old system which was alot quieter than mine is now, but even when I didn't have speakers there, the grilles alone were stopping alot of the sound transfer into the cabin. One day I just decided to pop them off and I could tell it was noticeably louder (keep in mind we're talking about a mesh covering vs no covering...if it was a solid metal sheet vs a hole...it'd have been an even much more significant difference)
Everytime you try a different position/direction facing in the trunk, close the trunk, and get back in the car just like you would regularly listen to it each time, having a friend sit in the passenger seat the whole time really helps too. You guys can figure out where and how to get it to maximize on cabin gain and minimize on backwave cancellation. Also, when you think you've found the loudest spot, while sitting in your seat listening, pop the trunk and see if it sounds louder. If it does (especially if its significantly louder) then you're getting bad backwave cancellation. If it sounds quieter when you pop the trunk, thats what you're looking for, it means you're getting gain.
In my car...if I have the trunk open, and you're sitting in the front seat of the car, subs on full tilt...its loud...but if you've never heard my subs on full tilt before and don't know what to expect you're in for a surprise when I slam the trunk closed and all of a sudden it sounds like I turned the volume from 30/60 to 50/60.