Got my Lobaks installed on my car. Of course there quieter than my FFR pipes but they make a lot of (air noise) . I guess the back pressure buils up enough to come out the end of the pipe in a air rush sound. I like my loud pipes much more but I'm shipping my car to Germany soon and I need the quieter pipes to pass inspection over there. I'm taking my loud pipes with me so I can swap them out when every I want so I can scare the hebee gebees out of the Germans.