the place i usually use, the guy is half deaf!
i asked him about exhausts last time i was there as i noticed him putting an emissions tester up a goldwing's orifice....
i thought they may have introduced emission testing without telling us, but he was just checking for oil burning.
regarding db testing, he said (quite sensibly) there's no point cos it depends how the bike is ridden,,, and if it passes, you will only put your loud ones back on after the test.
i went somewhere else to get the zx750 tested and got a cautionary on that for noise

its not a fraction as loud as the storm so i wont be going there again lol!
what does matter is track days. before i put baffles in mine i got it tested at 109db at 6k revs, and even then i crept it up there as gently as i could - at full bore, full rpm under load it sounds like a vulcan taking off.
so after fitting baffles i got it down to 99 which is quite a result imo, has to be 103 max for the track.
seen a few guys get turned away & theyve been frantically running round the garages trying to borrow some baffles - you can imagine how much of a pisser it would be if you can't get on.
(at cadwell btw the guys are usually very accomodating with noise levels and will back away from the bike until they get a low enough reading, instead of the usual 1m distance)