It's actually a joke, picking on European people because up to god knows how many percent of bikes, trucks and cars sceam past my house every day at high speed on a dangerous narrow road making unbearable noise because they have been fitted with cowboy straight through mufflers, I have seen 3 so far loose control and crash into car's which drive in the middle of the road, there's going to be a fatality soon, shame on the testing department, they can't even count lpg bottles or test brakes. I know what is wrong, the police are deaf, and colour blind when they see African girls working their streets they don't know if they are thai.
And the modifications of mufflers ect is big business, I wonder who owns the supply line?? Anyone know??