IMSA Camel GTP Laguna Seca 1986 

Thanks for posting. I was at this race. IMSA GTP cars employed ground effects which were inverted wings inside the side pods. That with turbocharging made for wicked fast cars. Ground effects has been banned everywhere since because these cars were too difficult to drive safely. [edit] and that's the old track before they screwed up Laguna.

Thank you, from 8 yrs later. I'm just blown away by this series.