Usually the modified parts are more expensive. According to the size of the car model, the roof area is large and more materials are needed, so the price naturally rises. Of course, there are hundreds of inferior ones, and there are fewer colors that can be changed. Because many original spare parts are very good, and the modification of the starry sky roof needs to go through the process of dismantling the roof, drilling, inserting optical fibers, fixing optical fibers, sticking sponges or cloth, trimming optical fibers, installing the roof after electrifying, and finally installing the roof, which inevitably destroys the roof structure. (3) Extended reading of commercial vehicle starry roof modification: Precautions for automobile modification: Never use interior fabrics at will: Most interior fabrics of automobiles pay more attention to anti-static, wear-resistant, breathable, flame-retardant and fireproof. Therefore, when decorating your favorite car, you should pay special attention to avoid assembling unqualified decorations. Especially in the use of the steering wheel cover, if the steering wheel cover is hard, it will bring some negative effects to the use of the steering wheel. The steering wheel is slightly deformed, and the steering wheel cover that is too thick and too big is uncomfortable to hold.