Haha, no they're not stupid, but its not their business to check how its legal, as long as it is.
to put it into perspective, my gasket(metal plate) was flimsy and when you accelerated above 3K you could hear air escaping like no tomorrow, but the tester didn't say anything!
And i'm sorry, my mistake, the legal limit in vic is 90dB, not too sure why i typed 40 haha