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NJ Emissions Testing Euro 928

Engine

Vehicle Information: Year: 1983; Engine (size, modifications): 4.7; Total Mileage: 53000; Transmission type: Manual;

I've almost gotten my 1983 928 Euro through NJ State inspection. The problem is it failed for NOx being 1% higher then allowed. The car runs really well Any ideas on what adjustments I may want to consider?

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