I saw them. They were at the Grand Canyon a few weeks ago. They stopped at the same restaurant we did. They were all speaking German. I've got more pics.
Looks like some test cars, tail lights look really odd compared to the reg Chirons. Still an amazing spot though, there was a combo of 4 in Newport Beach CA not too long ago.
On a similar note, just outside of North Las Vegas on I-15 last week, I spotted two Aston Martin DB11s- one in black and the other in the manufacturer's wrapping. Perhaps the same kind of testing? High temperatures? Sadly I didn't get a shot of them, but wow were they shocking to see!
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