Quote Originally Posted by DinanM3atl
No problem.

Shoot around 2.8 to 4 and report back with results

You can use 1.8 if you are shooting head on as the side of the cars is hidden. What you physically see of the car is very shallow.
I would open it up more than 2.8. I would say more like 3.5 to 5.6 depending on how far off your subject is from the background and the lens you are using.