First drive with these things on was love at first sight. After a week or so it was as if my stocks got put back on, all that was left was a lower tone...breakin period over . Added a Y-pipe to bring back some volume and now it's perfect, not quite as loud as first install but still plenty loud for a lux sport coupe... it's there when you want it... stepping on it and nice low idle tone and not when you don't.. cruising.