Next, porting the waste gate: As previously pointed out by BB_cuda it is a good idea to increase the diameter of the waste gate in order to help with over-boost issues due to less restriction in the exhaust flow.
At this point I'd like to thank iaknown for having this brilliant idea and sharing this post with us:
http://www.e90post.com/forums/showthread.php?t=1074384
In order to do so, the pneumatic actuator has to be unbolted and pushed back in order to free up the "gate".