(Mondeo Tournament, Bj 97, 100KW) Hello, I bought a double ESD tube from Sebring some time ago and am impressed by the deep hum when it is warm first. I can’t decide on the following, because I lack all my knowledge to get a little more sound: 1. The ESD is flexed and cleaned up 2. or I leave it as it is and the middle tube is replaced to get this “fake blade”. In both variants the consequences are related to me. Engine performance (possibly damage!?) and also the consequences at the TÜV not known. My workshop says: “No problem… hollow center tube in and aperture over it. No one sees that and gets louder.” etc… Does anyone know? THX@ALL!!