Sort of going to agree with them on this one. My bike has a loud exhaust and I like it like that so cars that I'm coming up on can hear me. It may be against the law, but I'm happy to take the chance and will cop it sweet if I get done for it. My old bike had a quiet exhaust and I nearly got cleaned up a number of times on the freeway with cars pulling into my lane while I was there. They don't do the same thing with e CBR as they can damn well hear where I am.
It is a lot easier with a bike, once your done for noise to just slip the factory mufflers back on for the vehicle check,then stick the loud ones back on. Takes all of 10 minutes.
Cheers - Gav.

