good used set here for the same money. I don't know about a lot of exhausts: Genie is the most quiet, but hard to find since they quit making them years ago. Stillen is quiet. ... The cats are only "attached" to the downpipes by bolts, unless someone modified it. You may be looking at the "pre-cats", which are the stock downpipes. While you're in there, you will want to replace the pre-cats with aftermarket downpipes. If money is tight, and you can't afford the latest and greatest 3" downpipes, any split downpipe will be a great improvement. You can get these used here too.