Double-Groove 2-2 Slip-Ons, E4, Matte Black FLHTLU 17-18, FLTRXS 17-18, FLTRU 17-18, FLHR 17-18, FLHRC 17-18, FLHXS 17-18, FLTRX 2018, FLHX 2018, FLHRXS 2018 17-18 Touring, The use of exhausts without dB-killer is not allowed in public traffic.