Is it legal to modify automobile exhaust?

It is illegal to modify the exhaust pipe. According to Article 16 of the Regulations on Motor Vehicle Registration of the Ministry of Public Security, small and micro passenger cars are equipped with front and rear anti-collision devices;

Freight motor vehicles are equipped with windshield, water tank, toolbox, spare wheel rack, etc. Increase the interior of motor vehicles. All three situations are allowed. In addition, changing the brand, model and engine model of motor vehicles and changing the appearance of registered motor vehicles and related technical data are all illegal modifications.

Improve the basic principle of exhaust;

Regardless of the manufacturing cost and other factors, the original model usually considers whether the engine output characteristics are suitable for daily use when designing. Especially when driving on urban roads, sufficient low-speed torque output can give consideration to the advantages of good driving and fuel saving.

Appropriate high exhaust back pressure design can ensure the output characteristics of the engine at low speed and high torque, but the exhaust system of this design will form resistance at high speed, which will hinder the maximum power. The modified exhaust reduces the exhaust back pressure through different designs and materials, and improves the intake efficiency of the engine, thus improving the maximum power output and changing the torque output characteristics.