Could it be that Porsche still has new RSR DFI engine in development and decided to use current RSR engine for next year's testing program?  Perhaps they don't want to show all their cards at once.  It seems a DFI  motor is being developed for 991 GT3 car scheduled for launch late next year. 


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2006 997 C2S Cab, Triple Black,  2006 Cayenne Titanium Iceland Silver Metalic New York