All we can do with Uprev is disable the code so that the CEL doesn't come on, that's what a lot of tuners do automatically for customers with test pipes without even telling them. It will keep the CEL off, HOWEVER if you go for emissions and they perform an OBD2 scan some of your O2 functions will show up as "not ready".. whether that will fail you or not depends on the guy running the station.
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