Mine is a 96 Cobra coupe. I can fit 2 10's, probably even 2 12's, I just can't afford to give up the space to do so. I am just going to use a box that will stand vertically and face either forward or rear. If I was to lay it on its back I would have a lot more options for subs, but I have ran 1 10 before, and it was more than enough bass. 1 8 should add the right amount of bass, and adding a second one is always an option. Really, I would like to stay under $300, and if all goes well that will be with paying someone for a custom box. I've always used sealed, never messed with ported, but from what I can tell people are getting excellent SQ from ported applications. Since the box size is almost the same for the JL, it is really at the top of my list right now. I have 11 inches of height (might could go 13), 19 inches wide, and 3 inches (more depending on height) top depth. I might could fit a 10, but with the airspace I don't think it would perform well. So, best option would be the JL 8? I am going to look into the other ones mentioned, such as the DD, and they will be considered. Thanks to all, and any more input is greatly appreciated.