Here in Qld some modfications are approved by a system of authorised officers who get approval from QLD Transport , any mod that is done and is listed in the appropriate codes then has a modification plate fitted to the car . Interstate can be very different as I found out some years ago . I used to fit sunroofs and there were no approvals needed in QLD but if any of those cars was reregistered in NSW we had to supply a letter from the manufacturer / distributor to say that we had fitted the sunroof to the manufacturers specifications then they were happy . You would need to have the cars original options so anything that might have been changed matches or does not exceed those specs . You could approach an auto engineer who would charge a fee but they would be able to tell you whats legal or not . Some things may pass no worries but others may be too far away from legality .
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