Is Modifying the Exhaust Pipe Illegal?

[GiaFitz]

Modifying a car's exhaust system is not illegal. Here is some additional information: 1. Regarding the annual inspection of modified exhaust systems: Many car owners modify their exhaust systems, and a common method is to install a larger diameter exhaust pipe. However, since this modification alters the vehicle's appearance, it will not pass the annual inspection. On the other hand, installing a variable exhaust valve, which is not noticeable from the outside and produces normal sound when not activated, can pass the annual inspection. 2. Situations requiring application for modification registration: (1) Changing the vehicle's body color; (2) Replacing the engine; (3) Replacing the body or frame; (4) Replacing the entire vehicle due to quality issues by the manufacturer; (5) Converting a commercial vehicle to a non-commercial vehicle or vice versa; (6) When the vehicle owner's residence moves into or out of the jurisdiction of the traffic management department of the public security authority.