Looks like they are offered, was on Fchat and followed a link:

http://www.capristoexhaust.us/Capristo-exhaust-for-Porsche-997-Turbo-p/997%20turbo.htm

Looks about 5K, but has some cool valving like PSE. Nice outlets.

 

Wow, this looks like some quality stuff.

'Rocket

 

You may ask member HN-997GT2, he is using one on his GT2.

 

i am using FVD exhaust and they also has an exhaust with valving function.