Just as a fair warning to all those who will be riding off to Austria (Tirol) this summer:
Local government closed down several roads due to noisy bikes. They take the amount of dB's that probably in your case is written in your MOT. It is the homologation value.
They will act as if it's an evironmental misdemeanor the moment you ignore the signs.
I've seen this more often in Austria (speeding = environmental), but this one is new to me. So, just in case, take care.
I don't know whether they will make actual recordings of your noise the moment they find out your bike has after-market endcans.
Seems we are forced to go electrical all the way (over my dead body for now; I'm a petrolhead!)