Ok, I've just spoken with the EPA and they use clause 20 of the Protection of the Environment Operations (Noise Control) Regulation 2000 to defect pods.
This means that the 90 dB limit is what applies here. So if your exhaust is under 90 dB there is nothing they can do about your pod. There are strict testing procedures for exhaust noise but nothing prescribed for pod noise so the law is ****ed here.
Clause 20 states :
20 Repairs and modifications
A person must not cause or permit a motor vehicle’s engine, or its air intake or exhaust system, to be modified or repaired in such a manner that the maximum noise level of the motor vehicle after the repair or modification (regardless of the noise level of the motor vehicle before the repair or modification) exceeds the maximum noise level specified in Schedule 1 for that kind of motor vehicle.
Maximum penalty: 100 penalty units in the case of a corporation, 50 penalty units in the case of an individual.
So if you're under 90 dB they got nothing.
more to come...