Most cars ECU's have read/write capability through the OBD II port these days. I know because my friends reprogramed their ECU's on their VW's with this dongle thing and increased their boost for their turbo. If you had access to the programing language for the car you could plug in a device with a radio into that port and control the car's accelerator, ABS, Airbags, anything that's controlled by the ecu.
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