I made a custom enclosure which is down in the spare well. I also have the amp in there. I was looking to hide all the stuff so I didn't have to worry about getting it stolen.
Mine is only a 10", I could have went bigger, the volume math works out, I just figured 10" was enough.
Oh, by the way, when I get on it, I can't hear the stereo.:hihi:
1989 Mustang GT