What does XkCS mean anyway?

[Chad Frederick <fredie@u.washington.edu>]

I was wondering what does the CS stand for that follows 4000 on my car?

I have looked at many other 85-87 4k Quattros and some say just S following
the 4000.  They don't look any different in options and one I looked at
yesterday that had the nicest leather interior I have ever seen on a 4k Q.
So while I am at it, what does just S stand for.  I have always wondered
this but had no one to really ask.

Thanks,
Chad Frederick
86 4kcs Q
with to much new stuff to list since I bought it three months ago and that
car has taken all my free time.  But what a great car.