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if it's welded throw away your chances of registering it again but if it's bolted in you can still register it either way i would still take it out also it will need a engineers report/blueplate whatever there called down there
hmmm who to believe. seriously. its a tough choice.In Victoria you can have a cage (welded or bolted) legally, so long as it conforms to guidelines set by vicroads.
You don't even need an engineers if it's constructed as per the guidelines.