Removing the cat will make your car 2x louder. It can also become very raspy. How it sounds really depends on the Catback after that. My borla can sound nasty wide open but it sounds pretty good when its closed off running all through the muffler. My buddies 2OTL sounds pretty good with his offroad pipe. Trust me loud can get annoying. I would just keep your cat and if you want loud add a cut out.