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If you goal is to pass emissions, I think the dual chip setup would just complicate things. My chips usually pass emissions even in the toughest state of California. It's the cars that are marginal that have some difficulty because if there's an air leak, a cylinder or injector imbalance, poor maintenance, bad valve guides, a worn cat, or whatever, the NOx can go over the limit. For smog testing, I'd recommend connecting the two pin 10 brown wires by the DME to reduce the ignition timing and lean transient enrichment further reducing the NOx and HC emissions, and disconnect after you're done. The stock chip is optimized for emissions as it runs with a lot of ignition retard, and a tightly controlled lean stoichiometric mixture, giving you lots of emissions margin to pass smog, even with a lot of the types of mechanical defects listed above. One of my customers who is now an engineer for Boeing, used to work for CARB in the 80s, said when they were emissions testing cars, the Carrera measured to be the second cleanest car of all cars manufactured next to a Toyota subcompact. So while the California and US cars smogged clean, they also ran like dogs.
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