Akrapovic tested it and came up with 98.6 db. Seems a little high since a common race baffle from Yosh is 96 db. My K2 750 stock system had an 80 db rating. Not sure how Akrapovic tested and if they tested from the same distance from the end of the tail pipe which I think needs to be 20 ft. away for an EPA test.
The new muffler is definitely louder than the older models. I can verify that first hand especially at full power. It sounds really good about as loud as a Yosh TRS race muffler I had which has a 96 db rating. If it were not for the SET valve it would be even louder than it is now.