I have a 2004 Grand Prix with factory dual exhaust and these (21502, 21503) fit exactly the same muffler size and dimensions. These are quiet mufflers (hence the name "Quiet Flow") that sound very close to factory mufflers, maybe a little quieter than stock mufflers. Tips welded to silencers are useless in my opinion. These are NOT stainless steel tips, they are very small and don't look very pretty but I'm sure someone less picky could live with them, but that wasn't a problem for me as I…