Hi there. Maybe you remember I sold my ninet. Last weekend I received a call from the new owner. I sold him the bike with the flap killer removed and original part apart. He asked me if I know if the bike will pass the periodic inspection without problem as far as noise and contamination is concerned. I said I think it may change little bit the db but not the pollution. Did any of you pass inspection with the wonderlich Klappenkiller installed? You opinion abt this matter will be very much appreciated. Thanks.