I dont belive any cat back exhausts come with cats, high flow cats or test pipes. A cat back exhaust will bolt up to the cat and go all the way back. You can get a test pipe(straight thru pipe) from like ebay if you search test pipes, testpipes.com, or you can go down to your local muffler shop and have it done. A test pipe will fail emissions though. You can probably get a cat from your local dealer or get a high flow cat.