Most rolling shots are done at walking speed, not 60 mph.
You were shooting the wrong side of the car. You will get much better shots of the car, by having the Sun somewhere behind the camera.
Use a CPL filter.
your shutter is too fast. Nice car though. It should look like this panning shot I did. Technically rolling shot is a lot easier, but it will involve more people and 2 cars.
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3 is a win. 5 edited looks way better. Others I could do without

