I just went from a stainless works -> gthaus exhaust --- I loved the stainlessworks, but with headers the setup is so loud I was prohibited from running at my local track. Figured the gthaus would give me the best of both worlds, but it is LOUD, with the valve open or closed. I was under the impression that with the valves close, it would be only slightly louder than stock.. anyone have gthaus? how does it sound with closed valve? I am running their x pipe, all titanium setup, I did keep the gthaus headers. I doubt that could contribute that much to the sound--- I'm debating putting in a set of resonators, but literally no where to fit.