Well proof of the pudding is that my August built car when I scanned it using VCDS list the structure borne sound actuator (SBSA) in the CAN gateway, can be reached and can also be put into diagnostic mode so it's certainly there.
Can't imagine any GTD's didn't come with it (which means VW are either lying, or more probably as usual, know feck all about the cars they sell). This then poses a question, if the external special exhaust system with the built in sound actuator isn't part of the package, and the SBSA is already fitted, then what exactly does that £250 buy you ? painted red calipers ? (I did mine myself for £10) !