6000
When I drive my 2.0T MK6 DSG in sport mode, it goes all the way to 7500 before changing gears. Crazy if you ask me, since redline is 6000. I made a thread about it and it seems to be happening across the board with MK6s. My solution, shift manually. If I use sport mode, I still shift manually when it reaches the optimum RPMs. I don't feel comfortable letting the engine rev past redline.
I'm pretty sure APR doesn't bump up the rev limit unless you ask them to. It'll be a custom file.
6500 is stock redline for 2.5L if I remember right.