Maybe this is just a rumor, but I read somewhere that a California car that reads high in the sniffer test will get sent to a STAR station the next time around. My old MR2 Spyder certainly did. You would want to remove the warm air intake for smogging the car to reduce the NOx if that rumor is true. Actually you'd want to remove it anyways so that you don't risk failing if your cat is old.
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