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Speed is determined by the wheel speed (ABS) sensors, not by the speed of the output shaft in the transmission (like lots of cars).
If the ECU uses output shaft speed to determine speed, then a final drive swap will affect speed display. Since these cars use the wheel speed sensors, it's not an issue.
Now changing tire diameter does since it's after the sensors.
As for correcting it, as far as I know it's not an option with OFT or EcuTek at this point.
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