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  1. SoCal2024

    Dos Secondary Air Injection System Can Help to pass Euro 4 level with under body cat?

    Hi every body. It is an old vehicle matches Euro 2 standard requirements with under-body Catalyst. We added a close cuple Catalyst to improve it to Euro 4, but back pressure raised so as the output power is not satisfactory. I need to know if anybody has the experience to use secondary air...

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