Put some steel wool in your silencer for scritineering
Failing that, for road worthy inspections on my road 2T's, there are a few tricks to get the detectable noise levels down.
The exhaust tip should face towards the ground which means the sound travels twice as far (pipe to ground to sensor) and encounters losses when it hits the ground and reflects, to further the effect of this mod, the downward facing spout does not need to be made of metal, you could use a silicon hose peice which would absorb more sound.
Thirdly: cut your expansion chamber open, extend the stinger inside the pipe so that the stinger tube opening is now several inches inside the pipe, not at the end. This decreases sound levels by a large amount and does not affect performance at all.
Get a good fabricator to take everyones exhaust system and carry out all the mods at the same time on everyones bikes.
Will make it nice and cheap and then there will be zero issues regarding noise tests!