Judging from the current restrictions imposed by the traffic control department on automobile modification, automobile displacement, turbocharging and other parts related to automobile technical parameters are not allowed to be modified privately, and laws and regulations have restrictions on automobile modification: the model, engine model and frame number of the automobile cannot be changed, and the body structure cannot be damaged; If a car changes color, engine, body or frame, it must be submitted for inspection; if it changes engine, body or frame, it must also submit a certificate of motor vehicle safety and technical inspection; The car sticker area cannot exceed 30% of the total car body area, and it must be approved by the relevant department; The appearance of the car cannot be changed greatly, and the requirements are basically the same as those in the driving license.

Obviously, adding a ceiling is definitely not a modification. Unless you exaggerate your roof.