There is no rigid requirement in theory, and it does not belong to the category of modification. Order of Public Security 124 stipulates the installation, allowing the installation of water tanks, tool boxes, wind hoods, etc. There is no need to apply for change registration, but the modification and installation of the fuel tank is not in the details that need to be changed, and it no longer belongs to the category of illegal modification. By default, it belongs to the scope where modification does not need to be registered! But when it comes to traffic police, traffic control and transportation management, it's hard to tell! After all, you know!