I can’t speak to specifics but I can give you some ideas.

So the obd port might have some basic info such as acceleration and turns since and/or at least torque/thrust readings that you can poll since insurance companies and others have devices that use them to track your driving (often paired with GPS which you don’t need)

So some arduino project that lets you plug in and poll that data and to establish a trigger for some audio could be fun.

http://arduinodev.com/connect-arduino-to-a-car-through-obd-ii-port/

Pair that with something else that lets you connect via auxiliary or Bluetooth so you can play it over the speaker and you might have something.

https://github.com/pschatzmann/ESP32-A2DP

This might be easier since a pi would be better suited to playback of audio and might be easier to get everything connected and to tinker with the Python to respond to certain readings

https://www.instructables.com/OBD-Pi/