Looks like a 3 flash setup just counting the shadows. One on the left, perpendicular to the car, one on the camera itself, and one to the right of the camera and mounted higher.
Quite nicely balanced light on the car, but ditto putting the car at the bottom right and it looking out of the frame. May be better to frame it in the middle or biased to the left side of the frame.
2 flashes were used plus one more SB-800 as commander. Both off-shoe flashes are firing at full power... Nikon D70s + Nikon 18-55mm f3.5-5.6
1/500s, F8, ISO 200
The sky was both overexposed (the sun) and underexposed (the rain clouds). Post processed to get the constrast and stuff...
Personally think that the lightings ain't good enough because the lighting is not even enough. Will try to experiment again with the lightings...