Probably either the jack in the trunk, or the wiring in the wing, those seem to be the two biggest culprits. I've never noticed a problem with my jack *knock on wood* (OW! my head!), but the wiring in the wing really bugged me, especially after putting the sub in my trunk. But a little expanding foam shot in through the opening for the brake light worked pretty good. To really do it right, I would have to remove the wing, and spray the foam in from the base, too, but it doesn't bother me much anymore, so I'm going to do that. Oh, and if you do this, us foam thats minimal expasion! If you use the stuff that gets huge, you run the risk of splitting you wing if you get enough in there!
