There's a weird popping sound coming from what seems to be underneath the center consoil where the cd player is.. I was reading through a post and seen exhaust leaks being common for v6 mustangs 99-04, so I was wondering is it possible that this is a exhaust leak? If so what exactly is a exhaust leak, is it like a very small hole in the exhaust or some thing, and does this hurt my car in any way?