I built a custom sub inclosure for my 01 Gt if anybody has wanted to do it. I mounted a 12" sub in the drivers side rear quarter panel. The reason being, I didn't want to take up space with a box, and she is a grocery gitter. This is not a custom fiberglass enclosure. I built it from scratch out of wood, and covered it with walmart dash carpet, which could be painted with carpet paint. If anybody is interested, I can give the build details. It sounds good, and has great front imaging. It isn't as bright and punchy as a box would be, but is out of the way, and looks like it belongs.