Most Kappas are unique, especially when taking all options into the equation.
I have a very simple nothing special 2.4 Solstice and when taking all options into account my car is 1 of 1 for 2007
Compnine gives tons of very valuable information which we would not have without their services.
Actually, this is where the CompNine data falls apart (especially for 2007).
CompNine's data for 2007 is very faulty, as most of the Kappas for that year are not correctly identified in their database and therefore end up not being included in the totals.
Furthermore (for all the years), their "rarity" computation includes all RPO codes, not just what we would consider "options". These RPO codes include internal things like "build week". This means that a completely identical car built a week later (maybe even just the next day) would be "different" in CompNine's rarity computation.
To get a real idea of how rare a Kappa is from the CompNine data, you need to examine each combination of just the "real" options (i.e. color, seats, transmission, radio, spoiler, etc.). It is a time consuming and tricky procedure, but it IS possible (at least for years other than 2007).
If you just look at their rarity computation, almost all Kappas end up as "1 of 1" or "1 of 2"...and that's just completely misleading.