I DON'T think that the car in this thread is a quad cam car.
It does obviously have the AMG dress up kit, but I seriously doubt of it has the AMG special Quad cam M117 engine and drive train. I have spoken to the owner of such a car as the one shown here, with the dress up kit ONLY. In fact, that one was white, and may have been his car.
He was the guy who told me of the numbers produced and the number that was in Australia. I reason that his story is true, because if the illustration of the AMG M117 quad cam engine in the book to verify his remarks independently.
There have been a number of W126 coupes that have been re engined privately.