Yes it is but not offence no problem on 98db track days - thats with the baffle in!!
To me it sounds great, well did until a Coils stick went. then sounded like a tractor
Blimey - my standard Tre can clocked exactly 105 db at Castle Combe recently. I have suspected that they hold the mike a bit close, as they have a major problem with whingeing neighbours - y'know, the type who buy a house next to a race track and then complain about the noise

-and their continued planning consent to run the track is dependent on no breaches of the noise regs. Last year they clocked my Fazer 1000 with a full Akra system, with baffles in, at 111 db's! I had to take the baffle out, wrap it with muffler padding and re-fit it to scrape in at 105. A guy was there with a Manx Norton, and he failed, although he has ridden most of the tracks in the country and never failed anywhere else. At Silverstone a couple of weeks ago, Rodder's Tre sounded quite quiet on the track compared with many of the bikes there, and they have a 105 db limit.
So watch out if you want to do a track day at Castle Combe, you may fail the noise test!
Cheers
Ian