Some of you might be aware that Lakeside raceway is opening up for racing again (If you're not http://www.lakesideraceway.com). Some of you will also be aware that there will be noise restrictions, specifically 92dB. Sounds pretty lenient (with the road legal volume 93dB in QLD at least) however its not tested the same as QLD Police or QLD Dept. of Transport.
The test is done from 5 meters directly behind the car with the car revving at 5,000rpm for 5 seconds. I consider my car to be one of the quieter racers at track days and I registered 90dB which surprised me. My mates R32 GTR which sits probably middle of the range compared to other cars registered 98dB.
So if you intend to race at Lakeside make sure you have the car tested before hand so you don't get booted out on the day.