A couple of small corrections guys.
The 964 Turbo was actually called 965 and it was a rear wheel not an AWD. Previously on 911's history the 911 Turbo of 1976 was code named 930 , the racing version was the famous 935. Both 911's in model designation. In short the other codes are internal designations for the individual model, like the Boxster is the 986 and the Cayenne the 955.
Porsche over the years starting with 901 have given individual numbers in the 900's to all of their projects.
The RS designation comes from the word "renn Sport"which signifies the "racing"version of the chassis. Usually they signify lighter cars with not too many options, usually seem welded , more powerfull engines or blue printed etc, to be used as the basis for privateers,track days, claub racing and Porsche's own racing program. Over the years the also used the RSCS designation ( Renn Sport Club Sport) for club racing cars, CS ( Club Sport ) for lightweight versions of production cars like the 1988 rare 911 CS or the much sought after 968 CS.
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