LOL Tom,I am getting mad to work on that part over mine.In these pics is taped, but all other cars have it.The same for the lower diffusor, different and with bigger holes over blade.
Again, mines are just modelling considerations.APM model looks stunning and at a very very good price for a resin kit.
suspect is the latest 2011 version, also little different in the shape and dimension of the "cubes" on the lower part of tail,near diffusor.
I tried to copy this one, even if seems a later modification to that part,done recently.
Now I just miss a slot company as Carrera Digital making it in plastic as the Porsche rsr slot body for few euros available on ebay...and I can quietly suicide.