Hey Bones
The 953 is a pet project of mine. If you look back through the last couple of years in PPost you'll find my article on the car. It was developed in late '83 by Jacky Ickx and managed by Porsche head of sport development, Peter Falk.
It is a 3.2 Carrera. There were only 3 built. It used a stock 3.2 litre engine producing over 300 bhp and came 1st, 6th and 26th in the 1984 Paris to Dakar.
I have a chapter about this car in my book - if you can wait until January?
The 953 was born from the 954 - it was effectively a 4x4 version of the SC RS. The 4x4 system (manually operated on the 953) went on to provide the basis for the 959. In official Porsche production numbers, the 953 is listed under 'E' as a 911 Coupe code 10, chassis numbers 0020, 21 and 22. The 954 however, is shown as a 911 Carrera but coded as 11 where 20 are shown as being built in MY 1984, also under the 'E' programme - chassis numbers 0001 to 0021.
These are great competition 911s. The SC RS was much more widely used and had many race successes. The 953 only appeared once but did the job intended by Porsche.
Does that answer your question?