They must not believe in cautions! At one point (around 5:45) you see them weave through a couple of spun out cars. Just before that you see one of the Mustangs eat some dirt:

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Cool video. Looked like a vintage race to me, rather than open track. At the 5:45 mark, you hear them lift out of the corner and gently go by the spun cars. Then it's back to action. That kind of incident wouldn't warrant a full course caution.

 

That is a cool video....

 

Thats a very good video. Excellent!