My 959 with end cans and Pipewerx closed end baffles blew 102Db static, wet mode, leant over and a bit below the requested revs at Mallory. The same setup at Donny drive buy in race mode, bouncing off the limiter hit 102 drive buy on a 98Db day. Black flag x2 Go figure EDIT. If it helps, a v2 was allowed out at Bedford who are daft strict. Standard system. They make Ducati allowance for standard system but not anything that has been upgraded.
I ran an Akra system on my V2 for 300 miles, sounds amazing!! I never fitted the baffles, not sure in dB. I'm not refitting it on my Bayliss so if you're after a full system give me a shout