(Removing the Intake Manifold)
Consult the STI shop manual for detailed steps to do this. Be carefull disconnecting the fuel lines and clean up any fuel that is spilled.
MARK AND TAG EVERY VACUUM LINE AND WHERE IT GOES.
I did not do this, but boy do I wish I did. There is a rats nest of small tubing and it can be (IS) very confussing to re-assemble once the manifold is now rotated 180degs. It will probably take you at least a day to port everything on the manifold/TGV assembly, YOU WILL FORGET WHERE ALL THE LINES GO. Double and Tripple check your connections against the exploded intake manifold diagram from the shop manuals. You don't want to remove the manifold to fix a stupid mistake.
With the intake manifold removed, PORT THOSE TGVs and re-rout all of the vacuum lines to the fuel regulator, EGR, etc. The hard fuel line DO NOT GET ROTATED. Just remove them and re-rout the air lines to them. Make this as neat as you can and wire tie everything down. It is much easier to do this with it off of the car.