Filters are the only way for daylight. Even at ISO50 @ f32, I have problems. A 10 stop ND filter would be awesome but need to be careful of vignetting on a UWA.
I would recommend pushing the car with the gearbox in neutral. Less vibration from the engine and only vibration should be from the road.
This was the original motion shot
Here it is finally edited
I had to use a composite of the stationary shot and the motion shot to bring back sharpness. If I had pushed, would have required WAY less editing.