How to Upgrade from National 5 to National 6 Standards for Vehicles?

[OmarMarie]

Upgrading from National 5 to National 6 standards can be achieved by enhancing components such as the three-way catalytic converter and the engine ECU logic to improve the vehicle's overall emission standards. Relevant details are as follows: 1. It is not recommended to do so, as this involves the original factory calibration of the engine. Modifications that have not undergone rigorous testing may lead to unforeseen issues. The vehicle's emission standard is already documented in the factory-issued compliance certificate at the time of production. Even if the standard can be improved through modifications, it cannot alter the original record at the vehicle management office. 2. Optimizing the exhaust standards can make it easier for older vehicles to pass annual inspections. If the exhaust emissions fail to meet the standards, regardless of whether the vehicle is new or old, it will ultimately be prohibited from being driven on the road.