the cobra is most likely a replica because of it's wheel design. I think that on a real cobra there is the Ac logo on the wheels. Here are some pics of cobra wheels on real AC cars.
New Cobras
others...
They cobra wheel is basicly kinda like a blender blade.
I didn't go to the race but i was in the area eating at a "fast food restaurant". I decided it be nice to see whats happening outside so the closest corner to where i was, was corner 6 on the track picture above (i think) there were a few layers of tires and i was lucky to come out right when j. wilson's car spun out . i saw the champ car crew push it out.
I hope the owner of that bmw gets some sense knocked into him so they can remove those ridiculous stuff. I've been seeing it around town lately too, so if i meet them i'll talk to them to see why they did that.