Well, I can only say that my P source almost fully confirmed (well, not directly but, via clear hints) what Christian wrote.

Btw, regarding potential purchase of 991 GT3 I urge all of you interested to be very carefull. Finding a good used one in Porsche PZ offer is almost impossible. But, there are at least 5 new or almost new cars offered by so called "grey" dealers. Be carefull here and request VIN of the car that you are interested in. Also check the car in person if possible. Some of these 991 GT3s are not even in Germany. Some do not exist at all... Some are available in late autumn 2015. Be carefull.