Is it allowed to modify car interior seats?

[OTheo]

Modifying seats inside a vehicle is considered illegal modification. Car modifications mainly include two types: body modifications and powertrain modifications, such as brake systems, suspension systems, engine performance, etc. Simply removing seats to install floor mats generally does not count as illegal modification, similar to replacing tires with different brands but the same model. Relevant information about car modifications is as follows: 1. Regulations: According to the motor vehicle registration regulations, any changes to the body color, model, performance, purpose, or structure of a licensed motor vehicle, or replacement of the frame, body, or engine, must be reported to the vehicle management office for modification registration. 2. Benefits of modifying wheels: Installing a good set of wheels can improve heat dissipation and achieve lightweight goals, providing high visual impact both statically and dynamically, and enhancing the vehicle's handling performance. Increasing the diameter and width of the wheels and reducing the aspect ratio can overall improve the tire's grip.