It's been asked a few more times so to remind you all....
The bike noise limit is 102 DB.
Noise testing is carried out by the circuit staff using procedures as per ACU Blue Book 2019. We do not have any jurisdiction over this and it is your responsibility to make sure your bike either meets or ideally is quieter than this level.
If you suspect your bike might be a bit on the loud side either check it with your local MOT station or fit a standard silencer or a DB killer device.
If your bike is tested louder than 102 DB the bike will not be allowed on track - but may be retested at a later time.
Cheers for your assistance