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As far as emissions go for catless headers, if all they do for emissions testing is plug into your OBDII port and pull data will they be able to tell you've changed out the header? Anyone live in an emission-testing zone and having issues? My county doesn't do emissions testing, but it's always possible that I'll move to a county that does. I know some vehicles require an O2 sensor replacement to "trick" the ECU so you don't throw any codes with a catless header, but haven't seen anything about this for the BRZ.
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