Early S13 (SOHC) = ITA
Later S13 (DOHC) = ITS
S14 = ITS
Turbo Anything = ITE, which is a catch all class. Porsche 944 turbos fall into this class as well as any other car from other race series that are not prepped to IT trim. It has a pretty wide range of cars. Some days you could place high easily other days you'll get your arse handed to you. All depends on who shows up that weekend.
Not so sure about Autox classification.
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