Porsche 911s actually contested the Trans-Am series from 1967 through 1969. Considered a production sports car, Porsche overcame the FIA Group 2 touring car ruling to which the Trans-Am series was based on in its early years, by producing the 911R. Someone here may know for sure how the FIA decided what was and what wasn't a sedan at this time under the rules, but its my understanding it was based purely on how many seats the car had.

Porsche built the 911R with a tiny rear seat, thus allowing it to run as a sedan in the Trans-Am Under 2,000cc class against Alfa Romeos, Lotus Cortinas and the like. And while the Alfas were actually quite competitive with the 911s, Porsche won the U2 Manufacturers Championship in 1967, 1968, and 1969 before the FIA then decreed them to be a sports car, at which point they were banned from the Trans-Am, and were forced to run in production sports car races.

Pictured here are two of the top 911s from 1967; Bert Everett, chased by Hans Ziereis in the Valvoline-Opert Racing (usually driven by Fred Opert) variant. Everett actually spent some time leading this race outright in the wet conditions, before eventually being overtaken by eventual winner Peter Revson. But he went on to finish second outright, and first in U2.

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