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Per Scott Hair, the guy who did my car polishing last week, mine is a single-stage, no clearcoat.. and according to him, all RED 944's are that way (almost all RED cars pre-90's are single stage he said). Plus I think I've read that they are all that way, except maybe any metallic colors.
I believe all the metallic colors have to be two-stage by nature. I'm fairly certain my silver 944 is, since the clear has begun to peel away in places, necessitating a respray of the entire car Anyway, I echo what's said here about the base (non-metallic) colors being single-stage. That's my understanding as well.