Aha,
There was a PSE for sale at ebay.de that i missed.
Anyway there is some pics on the vacuum lines and a relay
So those parts is the parts im missing.
www.ebay.de/itm/Porsche-Boxster-986-Auspuff-Klappenauspuff-Original-2-7-3-2-99611198700-/160930856560 - Translator
Thanks Jeff!!!
*edit*
Radium,
I found a German dealer thats sells different exhaust with vacuumvalves, with a bit of luck i can get te Control unit there.
Tanks for the info!!