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Thundersports was essentially a sports-car version of Formula Libre with cars from Sports 2000, Group 5, Group 6, Can-Am, Group C and various other prototype categories all eligible; a number of hybrid cars appeared in the series.
Arnolt created a racing team for the Sebring 12-hour race, and in 1955, at their first attempt, the special lightweight cars finished first, second and fourth in the Sports 2000 class.