Im not sure. I think it raced atleast IMSA, LeMans, and similar Japanese series. If I remember right, one of those was JUN car.
This thing is quite rare tho. Later FC with similar look raced too. Actually it looks identical, roof is only different basically. It went on to later developent of Legendary IMSA FC 4 rotor.
I think rules changed in late 80's, banning cars like this and Slatnose Porsche 911. Also, again in 90's rules changed again, banning IMSA 4 rotor FC and IMSA Audis
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