although I doubt that its an issue to dyno the vehicle YOU own.
its actually really easy for BMW to see that the car was dynoed with a simple check of the ECU through the data port.
If a car is dynoed there will be a huge difference in the wheel speed sensors which can easily be verified. Rear wheels going 155mph while the front wheels are stopped. (or are rolling 5mph). Wheel speed sensor's are continually being monitored while the car is running either way.
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