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I would set the timing back to factory setting. I've heard you can run race gas '100 octane'- just make sure its unleaded race gas 110 octane is usually leaded which would plug your cat. I've heard from other posts this lowers NOx test numbers quite a bit- make sure to run your car for a while before hand to ensure the EGR has opened bypassing the exhaust gases. Just my 2 cents, good luck!

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Q: How do i lower my nox emissions can i use rubbing alcohol 98percent to help it pass does the combustion temp need to be cooler or hotter all ignition and o2 good timing is 1 deg lower than factory?
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