9PA, 9PA1 vs 955, 957?

[CaptJim]

Why on this Renntech site are we calling the Cayenne a 9PA or 9PA! and not the designation I thought was appropriate 955 and 957?  I know this site has dedicated Porsche enthusiasts on it who believe the only real Porsche is a rear engine air cooled....  Is this a way not to include the Cayenne in the typical Porsche three number designation?  

 

Just curious, not serious, I assume there is a good reason.  The rest of the world seams to use 955 and 957. 

[Loren]

With all due respect you are mistaken.

We use the same model numbering/labeling that Porsche uses in ALL their documentation.

 

(click to enlarge)

 

[CaptJim]

Okay, I am not saying I was right or wrong.  Where did the 955/957 designation come from if 9pa/9pa1 is correct?

[Doug_B_928]

It's an interesting question.  As Loren demonstrated, the 9PA etc. is in Porsche's documentation, but their part numbers often have the 955/957 (and probably 958 too), so this suggests that these numbers are also internal. 

[Loren]

Part numbers can start with any number or letters (they had to run out of numbers someday).

 

i.e. 000, 999, N, 95B,  etc., etc. etc.