IMSA
Had Trans-Am started with FIA group 2 rules, after a "sedan" start the IMSA series looked more like the German DRM series,Touring cars competing with GT's - so Porsche could not be far away....
IMSA |
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Sedan years | 1969 1970 |
GT years | 1971 1972 1973 1974 1975 1976 1977 |