SHADOW

It's the Weathertech International Challenge at Road America this weekend. It features all sort of vintage race cars. The headliner is the largest collection of vintage Eagle race cars in one place. They've done some on track driving but a BIG group photo is planned for tomorrow morning....just in time for Motorhead Sunday.
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This is one of the Shadow machines from UOP (United Oil Products)....a '74 DN4 8767 and it's being driven by a former student of mine.  Good fellow.
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If you want to learn a bit about Shadow Race Cars check the Wiki link below:
https://en.wikipedia.org/wiki/Shadow_Racing_Cars
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If you'd like to take a lap in a Shadow at Laguna Seca race track in California, check this link:
https://www.youtube.com/watch?v=mp636wHV0zY
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If you're really intrigued and have an hour and forty minutes of spare time, see the link:
https://www.youtube.com/watch?v=sZ_YFg8JdzE
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It's one screaming machine.  Best seen in Large.