No such thing, unfortunately... IIRC the GReddy SP2 isn't too bad with a stock y-pipe and cat, but I haven't heard too many others recently. Custommaxima, Frankencar, and Cattman all probably have something, too.
If it looks loud, it probably IS loud. And most aftermarket exhausts, once you add an aftermarket y-pipe, tend to get MUCH louder and more obnoxious, so keep that in mind.
