Not a chance, duty will never disapear, and you pay duty from $100, if the duty to collect is less than $50 than it is often not worth the paper work, but that depends on the person, checking the shipment on the day, new parts remain at 15% plus freight and good old GST on the whole amount, while ever the goverment makes money out of us suckers who own US built cars we will pay
Sorry to blow this subject to bits, well not really, its just the way it is