But seems like a lot of work for very little reward as the car will not invisible or completely silent anyway. I'd rather believe that they just put "some exhaust" on it and sound tuning is for later.
I think the wind is also playing tricks and taking a bit away from the volume as clearly those vids were not shot with the highest quality camera ever. Unless it is just the wind, in the shorter video sounds like there is another louder car on the track.
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