make an enclosure and take it to get cleared
pod laws vary state to state, in qld it used to just be that it must be secured and unable to move more than 10cm or something crazy
but i think qld police get cops from different states cos i've been told by a cop that my pod was flat out illegal
just had a quick google and pretty much every australian forum has a thread like this and most say that in nsw the pod has to be "enclosed"
re the venting noises, thats the stock plumb back bov doing its job, go talk to the police station that issued the defect and show them the return line
then also remind them that its a family wagon