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if your nox is high, you either have.. carbon build up in your combustion chambers causing your effective compression to increase causing higher combustion temps which cause NoX to form above 2500 degree's F. Your other numbers look ok. if you really want to try something out. put a bottle of 90% osoproply alcohol into your gas tank and that will lower your NoX emissions. it varies by car. give it a try. Make sure your timing is correct. clean your maf sensor. could be causing a false reading causing your car to run slightly lean and still within range of passing. also check to see if your o2 sensor is functioning properly. an o2 sensor to ensure proper functionality.
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Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180
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