I tried a while back to join the 260 club, as I always have hoped, one day, to get a v8!
However, I never succeeded, as far as I remember, you have to have a VIN number of a car, and that is not too smart, if you haven't yet got one!
It was a while back, but that is as I remember it.
If you have to own the car before you can join, then i makes it difficult to research the car, specs, problems etc before you buy.
Not that it would make much difference in my case. If one came by, I would snatch it, provided the wife has her attention somewhere else, momentarily!