I installed Porsche factory 997-GT3 camber plates.
I was able to get -3 degrees of camber on the front.

There was squeaking from the Bilstein upper nut rubbing on the car metalwork. I backed the camber off to-2 and it stopped.

But then I installed a slimmer upper mounting nut, also a Porsche Factory GT-3 part and reset the camber to -3 degrees.

I had the Porsche Dealer do all the work.