I just spotted this Cayenne Turbo S on eBay... good news for you, it works with a hitch!

 

Here is the Turbo S version. You can get it at Sunset Porsche for good price.

Oh well I can not attach the picture.

 

Part number 955-044-800-78
Rear embellisher kit set with mounting hardware
Sunset's price $1096.00 plus shipping. Still need to paint and have installed.

or possibly piece it together with (two components of the rear embellisher kit)-
955-505-526-00 Aluminum Apron Liner Bow ($193.50)
with 955-505-521-06-G2X Upper lower bumper cover/valence ($309.60)
Hardware - was told you would have to probably purchase all the hardware for the sport design kit because it is not itemized or broken down as to exactly what you will need for just the rear (about $35-45), and the hardware that comes with the rear embellisher kit is not available as a sep. purchase nor is it listed as to what specific pieces come with it.