How to Modify Exhaust Without Being Checked by Traffic Police?

[LaTaylor]

Installing a variable exhaust valve modification is not only visually undetectable, but also maintains normal vehicle sound when not activated, allowing it to pass annual inspections without attracting traffic police attention. The other two modification methods - increasing exhaust pipe diameter or adding an exhaust tail section - both alter the vehicle's appearance noticeably and thus cannot pass annual inspections. Detailed explanations are as follows: 1. Disadvantages of exhaust modification: While modified exhaust sounds exhilarating, it may disturb others' normal driving. Moreover, the exhaust system is a crucial vehicle component that shouldn't be altered casually to avoid excessive engine carbon buildup and premature failure. 2. Relevant regulations: The newly revised "Motor Vehicle Registration Regulations" recognize the legality of factory customizations and allow post-modification registration. Factory customization refers to vehicle personalization according to owner requirements, making such modifications legal. Furthermore, the new regulations permit vehicle owners to apply for modification registration at the vehicle management office within ten days after completing the alterations.