Some months ago I was riding my GSX1400 along the Putty Road (just north of Sydney) on a Saturday. I was amazed at the number of police cars checking speed. At the northern end, the police were pulling every single motorcycle for a random breath test. While we were stopped, they examined every single motorcycle, looking for modifications. By the way, I agree with RBT but I can't help thinking a test BEFORE riding the Putty Road might save a few more lives! Back to my story, Mr. Plod noticed my Remus aftermarket muffler, couldn't find a noise compliance sticker (because stickers haven't been required since 2006) and issued me with an EPA inspection notice. I bought my bike without the noise-limiting insert so I was a little worried. I spent $80 ordering one from overseas but it didn't arrive in time for the inspection, which I passed without the insert (My bike - 91.5dB. Maximum allowable: 96d. In hindsight, I was a little annoyed by the whole affair: I wasn't pulled over for doing anything illegal and I wasn't pulled over for excessive noise. The officer was just looking for reasons to issue notices. With inspection fees and the order for the insert, it cost me $120 for obeying the law on a roadworthy bike! There's an interesting postscript, which may be of benefit to others issued with noise inspection notices. I used my iPad and the "Decibel 10th" app to measure the noise. I tried to mimic the inspection procedure as best as I could (see http://www.ntc.gov.au/filemedia/Reports/NatStatExhaustNoiseTestSept2006.pdf for details) and returned results within 1dB of the official test. The point is, if you get a noise inspection notice, you can do your own test with an iPad and it should give you a good idea of whether you will pass or fail. I installed the noise limiting insert and returned results mostly within 1dB of the free exhaust. The insert doesn't make much difference.