3 chamber flows + summit o/r H. It's loud but not crazy loud. But it's still louder than I think I want. I just want something that doesn't get all raspy in the top end. I've heard the Borla catback in person and it was sweet, but talk about $$$.
But I've only heard mine with the stock headers. I'm putting in BBK shorties with the new combo so I don't know how it will change the sound. Plus the new heads and cam will probably change the sound even more, so we will see.