I ran downpipe only for a few hundred miles....couldn't stand it. I ran a full 5" MBRP from it, with a muffler, and its still too loud for my liking. Might try to go to one of those billy badass Donaldson units but as far as I can tell from my research on their flow numbers I'm going to be restricting exhaust flow which I definitely don't want.
that little 472 just needs a big brother. it will quiet it right down