yeah they pulled me over 2 weeks ago (friday) (about a 1km line of cars) out front of ADFA, after driving past the white VE commy with the little camera on the side.
they blocked the 1 lane off and forced all into 1, so soon as you see it theres no where to run, you're stuck. !
they waved me straight into the closed off lane they were using to inspect, as soon as they saw me, checked exhaust (got me to rev it..), and ran mirror along underside of car, took my license for 5mins and then came back and said good-day. my exhaust is *right* on the limit of legal, and the guy said to me "wow that sounds really quiet!" so he was quite generous.
unless something is blatantly illegal I dont think they really mind, its more for unrego/unlicensed etc