Unfortunatley not a chance. It's not only Police that will be cracking down. Authorised officers can also report you if they think that your car is too loud. This results in having 30 days to get tested and prove you are below the aloowable limit. This requires a appointment and associated cost, can't remember but around $50. Does not matter if you are below the limit you still have to pay.
If you are over the hassle is then getting a new exhaust and another test (associated cost and maybe time off work). It's a real PITA. A lot of places may also say the car is too hard to work on, not enough space.
I went through all of this on about my third drive in Melbourne about a year ago.
Best just to be aware and short shift!