I haven't been riding with a CES fitted Rocket Yet! I have no doubt if a RMS inspector was having a bad day and armed with his trusty noise meter he would defect anything slightly over the decibel limit ,all the guys I have seen defected were on noisy Harleys, Suzuki M109s with after market pipes and old mate on his Duke with a lovely set of Conti pipes ,the re registering sound checks each year on bikes 4 years old or over usually sees the guys digging out their stock pipes just for the check ,then back to the "noisy" pipes
, as I have said the TORS are OK SO FAR!